diff --git a/apps/edr-passenger-api/prisma/migrations/20260516000000_seat_class_model/migration.sql b/apps/edr-passenger-api/prisma/migrations/20260516000000_seat_class_model/migration.sql
new file mode 100644
index 000000000..09761e476
--- /dev/null
+++ b/apps/edr-passenger-api/prisma/migrations/20260516000000_seat_class_model/migration.sql
@@ -0,0 +1,52 @@
+-- CreateTable
+CREATE TABLE "SeatClass" (
+    "id"          TEXT         NOT NULL,
+    "name"        TEXT         NOT NULL,
+    "description" TEXT,
+    "basePrice"   INTEGER      NOT NULL,
+    "isActive"    BOOLEAN      NOT NULL DEFAULT true,
+    "createdAt"   TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt"   TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "SeatClass_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "SeatClass_name_key" ON "SeatClass"("name");
+
+-- Seed default seat classes so existing coaches can be migrated
+INSERT INTO "SeatClass" ("id", "name", "description", "basePrice", "isActive", "createdAt", "updatedAt")
+VALUES
+  ('sc_economy',  'Economy Seat', 'Standard economy seating',  45000, true, NOW(), NOW()),
+  ('sc_business', 'Business Seat','Comfortable business class', 90000, true, NOW(), NOW()),
+  ('sc_first',    'VIP Bed',      'First class VIP bed',       135000, true, NOW(), NOW());
+
+-- Add seatClassId column to Coach (nullable first for migration safety)
+ALTER TABLE "Coach" ADD COLUMN "seatClassId" TEXT;
+
+-- Map existing serviceClass enum values to new SeatClass ids
+UPDATE "Coach" SET "seatClassId" = 'sc_economy'  WHERE "serviceClass" = 'ECONOMY';
+UPDATE "Coach" SET "seatClassId" = 'sc_business' WHERE "serviceClass" = 'BUSINESS';
+UPDATE "Coach" SET "seatClassId" = 'sc_first'    WHERE "serviceClass" = 'FIRST';
+
+-- Make seatClassId NOT NULL now that all rows are populated
+ALTER TABLE "Coach" ALTER COLUMN "seatClassId" SET NOT NULL;
+
+-- Drop old serviceClass column
+ALTER TABLE "Coach" DROP COLUMN "serviceClass";
+
+-- Add seatClassId to FareRule
+ALTER TABLE "FareRule" ADD COLUMN "seatClassId" TEXT;
+
+UPDATE "FareRule" SET "seatClassId" = 'sc_economy'  WHERE "serviceClass" = 'ECONOMY';
+UPDATE "FareRule" SET "seatClassId" = 'sc_business' WHERE "serviceClass" = 'BUSINESS';
+UPDATE "FareRule" SET "seatClassId" = 'sc_first'    WHERE "serviceClass" = 'FIRST';
+
+ALTER TABLE "FareRule" ALTER COLUMN "seatClassId" SET NOT NULL;
+ALTER TABLE "FareRule" DROP COLUMN "serviceClass";
+
+-- AddForeignKey
+ALTER TABLE "Coach" ADD CONSTRAINT "Coach_seatClassId_fkey"
+    FOREIGN KEY ("seatClassId") REFERENCES "SeatClass"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+ALTER TABLE "FareRule" ADD CONSTRAINT "FareRule_seatClassId_fkey"
+    FOREIGN KEY ("seatClassId") REFERENCES "SeatClass"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/apps/edr-passenger-api/prisma/migrations/20260516000001_seat_class_updated_at_default/migration.sql b/apps/edr-passenger-api/prisma/migrations/20260516000001_seat_class_updated_at_default/migration.sql
new file mode 100644
index 000000000..e1dc713c8
--- /dev/null
+++ b/apps/edr-passenger-api/prisma/migrations/20260516000001_seat_class_updated_at_default/migration.sql
@@ -0,0 +1 @@
+ALTER TABLE "SeatClass" ALTER COLUMN "updatedAt" SET DEFAULT NOW();
diff --git a/apps/edr-passenger-api/prisma/schema.prisma b/apps/edr-passenger-api/prisma/schema.prisma
index 4720eca82..a8d995698 100644
--- a/apps/edr-passenger-api/prisma/schema.prisma
+++ b/apps/edr-passenger-api/prisma/schema.prisma
@@ -64,6 +64,18 @@ enum Currency {
   USD
 }
 
+model SeatClass {
+  id          String   @id @default(uuid())
+  name        String   @unique
+  description String?
+  basePrice   Int
+  isActive    Boolean  @default(true)
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+  coaches     Coach[]
+  fareRules   FareRule[]
+}
+
 enum BookingStatus {
   DRAFT
   PENDING_PAYMENT
@@ -303,12 +315,14 @@ model Coach {
   tripId       String
   label        String
   serviceClass ServiceClass
+  seatClassId  String?
   capacity     Int?
   sequence     Int?
   coachType    String?
   amenities    Json?
-  trip  Trip   @relation(fields: [tripId], references: [id])
-  seats Seat[]
+  trip      Trip      @relation(fields: [tripId], references: [id])
+  seatClass SeatClass? @relation(fields: [seatClassId], references: [id])
+  seats     Seat[]
   @@unique([tripId, label])
 }
 
@@ -346,11 +360,12 @@ model SeatHold {
 }
 
 model FareRule {
-  id            String       @id @default(uuid())
+  id            String    @id @default(uuid())
   tripId        String?
   route         String?
-  serviceClass  ServiceClass
+  seatClassId   String
   baseFareMinor Int
+  seatClass SeatClass @relation(fields: [seatClassId], references: [id])
   currency      String       @default("ETB")
   refundable    Boolean      @default(true)
   validFrom     DateTime
diff --git a/apps/edr-passenger-api/src/app.module.ts b/apps/edr-passenger-api/src/app.module.ts
index e5c62a2bb..7b2f460d3 100644
--- a/apps/edr-passenger-api/src/app.module.ts
+++ b/apps/edr-passenger-api/src/app.module.ts
@@ -33,6 +33,7 @@ import { SegmentsModule } from './modules/segments/segments.module';
 import { AgentsModule } from './modules/agents/agents.module';
 import { ReportsModule } from './modules/reports/reports.module';
 import { FraudModule } from './modules/fraud/fraud.module';
+import { SeatClassesModule } from './modules/seat-classes/seat-classes.module';
 
 @Module({
   imports: [
@@ -66,6 +67,7 @@ import { FraudModule } from './modules/fraud/fraud.module';
     AgentsModule,
     ReportsModule,
     FraudModule,
+    SeatClassesModule,
   ],
 })
 export class AppModule implements NestModule {
diff --git a/apps/edr-passenger-api/src/main.ts b/apps/edr-passenger-api/src/main.ts
index 130fcf3ca..51dbe061e 100644
--- a/apps/edr-passenger-api/src/main.ts
+++ b/apps/edr-passenger-api/src/main.ts
@@ -169,6 +169,7 @@ Payment providers send notifications to:
     .addTag('Booking', '🎫 Booking lifecycle, modification, cancellation, refunds')
     .addTag('Dashboard', '📊 Home dashboard aggregated data')
     .addTag('Fleet', '🚂 Train services, coaches, seat configurations')
+    .addTag('Seat Classes', '🎨 Seat class management and configuration')
     .addTag('Fraud Detection', '🔒 Fraud detection, risk scoring, user blocking')
     .addTag('Live Tracking', '📍 Real-time trip status, location updates, crowd signals')
     .addTag('Loyalty', '🏆 Points accumulation, tier management, rewards redemption')
diff --git a/apps/edr-passenger-api/src/modules/bookings/bookings.dto.ts b/apps/edr-passenger-api/src/modules/bookings/bookings.dto.ts
index 0ef1debd0..03b3b4aeb 100644
--- a/apps/edr-passenger-api/src/modules/bookings/bookings.dto.ts
+++ b/apps/edr-passenger-api/src/modules/bookings/bookings.dto.ts
@@ -23,6 +23,7 @@ export class CreateBookingDto {
     enum: ['ECONOMY_REGULAR', 'ECONOMY_BED_LOWER', 'ECONOMY_BED_MIDDLE', 'ECONOMY_BED_UPPER', 'VIP_BED_LOWER', 'VIP_BED_UPPER'] 
   }) 
   @IsString() serviceClass: string;
+  @ApiPropertyOptional({ example: 'seat-class-uuid' }) @IsOptional() @IsString() seatClassId?: string;
   @ApiPropertyOptional() @IsOptional() @IsString() promoCode?: string;
   @ApiPropertyOptional() @IsOptional() @IsInt() loyaltyRedemptionPoints?: number;
   @ApiPropertyOptional({ example: 'ONE_WAY' }) @IsOptional() @IsString() bookingType?: string;
diff --git a/apps/edr-passenger-api/src/modules/bookings/bookings.service.ts b/apps/edr-passenger-api/src/modules/bookings/bookings.service.ts
index 5d99717d4..e44492f58 100644
--- a/apps/edr-passenger-api/src/modules/bookings/bookings.service.ts
+++ b/apps/edr-passenger-api/src/modules/bookings/bookings.service.ts
@@ -92,7 +92,7 @@ export class BookingsService {
     }
     
     // Calculate fare with age-based pricing
-    const baseFareMinor = await this.getBaseFare(dto.tripId, dto.serviceClass);
+    const baseFareMinor = await this.getBaseFare(dto.tripId, dto.serviceClass, dto.seatClassId);
     const adultFareMinor = baseFareMinor * adultCount;
     const paidChildrenCount = Math.max(0, childCount - 1);
     const childFareMinor = baseFareMinor * paidChildrenCount;
@@ -176,7 +176,13 @@ export class BookingsService {
     };
   }
 
-  private async getBaseFare(tripId: string, serviceClass: string): Promise<number> {
+  private async getBaseFare(tripId: string, serviceClass: string, seatClassId?: string): Promise<number> {
+    if (seatClassId) {
+      const fareRule = await this.prisma.fareRule.findFirst({
+        where: { tripId, seatClassId },
+      });
+      if (fareRule) return fareRule.baseFareMinor;
+    }
     const fareRule = await this.prisma.fareRule.findFirst({
       where: { tripId, serviceClass: serviceClass as any },
     });
@@ -208,7 +214,7 @@ export class BookingsService {
         fullName: bs.passengerName,
         category: bs.passengerCategory,
         verifaydaVerified: bs.verifaydaVerified,
-        seat: { number: bs.seat.label, coach: bs.seat.coach.label, class: bs.seat.coach.serviceClass },
+        seat: { number: bs.seat.label, coach: bs.seat.coach.label, class: bs.seat.coach.serviceClass, seatClassId: bs.seat.coach.seatClassId },
       })),
       payment: booking.paymentIntent ? { method: booking.paymentIntent.method, status: booking.paymentIntent.status } : undefined,
     };
diff --git a/apps/edr-passenger-api/src/modules/fleet/fleet.controller.ts b/apps/edr-passenger-api/src/modules/fleet/fleet.controller.ts
index 1557c2ece..c8b2c23ff 100644
--- a/apps/edr-passenger-api/src/modules/fleet/fleet.controller.ts
+++ b/apps/edr-passenger-api/src/modules/fleet/fleet.controller.ts
@@ -1,7 +1,7 @@
-import { Body, Controller, Get, Post, UseGuards } from '@nestjs/common';
-import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
+import { Body, Controller, Get, Param, Patch, Post, Query, UseGuards } from '@nestjs/common';
+import { ApiTags, ApiOperation, ApiBearerAuth, ApiParam, ApiQuery, ApiResponse, ApiBody } from '@nestjs/swagger';
 import { FleetService } from './fleet.service';
-import { CreateTrainServiceDto, CreateCoachDto, CreateSeatBatchDto } from './fleet.dto';
+import { CreateTrainServiceDto, CreateCoachDto, CreateSeatBatchDto, UpdateCoachDto } from './fleet.dto';
 import { JwtGuard } from '../../common/jwt.guard';
 
 @ApiTags('Fleet')
@@ -10,9 +10,47 @@ import { JwtGuard } from '../../common/jwt.guard';
 @ApiBearerAuth('JWT-auth')
 export class FleetController {
   constructor(private service: FleetService) {}
-  @Get('services')    @ApiOperation({ summary: 'List train services' })          getServices()                          { return this.service.getServices(); }
-  @Post('services')   @ApiOperation({ summary: 'Create train service' })         createService(@Body() dto: CreateTrainServiceDto) { return this.service.createService(dto); }
-  @Post('coaches')    @ApiOperation({ summary: 'Add coach to trip' })            createCoach(@Body() dto: CreateCoachDto)          { return this.service.createCoach(dto); }
-  @Post('seats/batch')@ApiOperation({ summary: 'Batch-create seats for coach' }) createSeatBatch(@Body() dto: CreateSeatBatchDto)  { return this.service.createSeatBatch(dto); }
-  @Get('analytics')   @ApiOperation({ summary: 'Fleet analytics' })              getAnalytics()                         { return this.service.getAnalytics(); }
+
+  @Get('services')
+  @ApiOperation({ summary: 'List train services' })
+  @ApiResponse({ status: 200, description: 'Returns all train services with recent trips' })
+  getServices() { return this.service.getServices(); }
+
+  @Post('services')
+  @ApiOperation({ summary: 'Create a train service' })
+  @ApiBody({ type: CreateTrainServiceDto })
+  @ApiResponse({ status: 201, description: 'Train service created' })
+  createService(@Body() dto: CreateTrainServiceDto) { return this.service.createService(dto); }
+
+  @Get('coaches')
+  @ApiOperation({ summary: 'List coaches' })
+  @ApiQuery({ name: 'tripId', required: false, description: 'Filter by trip UUID' })
+  @ApiResponse({ status: 200, description: 'Returns coaches with seat class and seat count' })
+  listCoaches(@Query('tripId') tripId?: string) { return this.service.listCoaches(tripId); }
+
+  @Post('coaches')
+  @ApiOperation({ summary: 'Add a coach to a trip' })
+  @ApiBody({ type: CreateCoachDto })
+  @ApiResponse({ status: 201, description: 'Coach created' })
+  createCoach(@Body() dto: CreateCoachDto) { return this.service.createCoach(dto); }
+
+  @Patch('coaches/:id')
+  @ApiOperation({ summary: 'Update a coach' })
+  @ApiParam({ name: 'id', description: 'Coach UUID' })
+  @ApiBody({ type: UpdateCoachDto })
+  @ApiResponse({ status: 200, description: 'Coach updated' })
+  @ApiResponse({ status: 404, description: 'Coach not found' })
+  updateCoach(@Param('id') id: string, @Body() dto: UpdateCoachDto) { return this.service.updateCoach(id, dto); }
+
+  @Post('seats/batch')
+  @ApiOperation({ summary: 'Batch-create seats for a coach' })
+  @ApiBody({ type: CreateSeatBatchDto })
+  @ApiResponse({ status: 201, description: 'Seats created' })
+  @ApiResponse({ status: 404, description: 'Coach not found' })
+  createSeatBatch(@Body() dto: CreateSeatBatchDto) { return this.service.createSeatBatch(dto); }
+
+  @Get('analytics')
+  @ApiOperation({ summary: 'Fleet analytics' })
+  @ApiResponse({ status: 200, description: 'Returns fleet occupancy analytics' })
+  getAnalytics() { return this.service.getAnalytics(); }
 }
diff --git a/apps/edr-passenger-api/src/modules/fleet/fleet.dto.ts b/apps/edr-passenger-api/src/modules/fleet/fleet.dto.ts
index bef3b5a9a..5aeadeae7 100644
--- a/apps/edr-passenger-api/src/modules/fleet/fleet.dto.ts
+++ b/apps/edr-passenger-api/src/modules/fleet/fleet.dto.ts
@@ -1,6 +1,5 @@
-import { IsString, IsEnum, IsInt } from 'class-validator';
-import { ApiProperty } from '@nestjs/swagger';
-import { ServiceClass } from '@prisma/client';
+import { IsString, IsInt, IsOptional } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional, PartialType, OmitType } from '@nestjs/swagger';
 
 export class CreateTrainServiceDto {
   @ApiProperty({ example: '301' }) @IsString() number: string;
@@ -8,13 +7,15 @@ export class CreateTrainServiceDto {
 }
 
 export class CreateCoachDto {
-  @ApiProperty() @IsString() tripId: string;
+  @ApiProperty({ example: 'trip-uuid' }) @IsString() tripId: string;
   @ApiProperty({ example: 'A' }) @IsString() label: string;
-  @ApiProperty({ enum: ServiceClass }) @IsEnum(ServiceClass) serviceClass: ServiceClass;
+  @ApiProperty({ example: 'seat-class-uuid' }) @IsString() seatClassId: string;
 }
 
+export class UpdateCoachDto extends PartialType(OmitType(CreateCoachDto, ['tripId'] as const)) {}
+
 export class CreateSeatBatchDto {
-  @ApiProperty() @IsString() coachId: string;
+  @ApiProperty({ example: 'coach-uuid' }) @IsString() coachId: string;
   @ApiProperty({ example: 10 }) @IsInt() rows: number;
   @ApiProperty({ example: ['A', 'B', 'C', 'D'] }) cols: string[];
 }
diff --git a/apps/edr-passenger-api/src/modules/fleet/fleet.service.ts b/apps/edr-passenger-api/src/modules/fleet/fleet.service.ts
index 6fa189666..ef6969aaa 100644
--- a/apps/edr-passenger-api/src/modules/fleet/fleet.service.ts
+++ b/apps/edr-passenger-api/src/modules/fleet/fleet.service.ts
@@ -1,13 +1,30 @@
 import { Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../../common/prisma.service';
-import { CreateTrainServiceDto, CreateCoachDto, CreateSeatBatchDto } from './fleet.dto';
+import { CreateTrainServiceDto, CreateCoachDto, CreateSeatBatchDto, UpdateCoachDto } from './fleet.dto';
 
 @Injectable()
 export class FleetService {
   constructor(private prisma: PrismaService) {}
+
   getServices() { return this.prisma.trainService.findMany({ include: { trips: { take: 5, orderBy: { departureAt: 'desc' } } } }); }
   createService(dto: CreateTrainServiceDto) { return this.prisma.trainService.create({ data: dto }); }
-  createCoach(dto: CreateCoachDto) { return this.prisma.coach.create({ data: dto }); }
+
+  listCoaches(tripId?: string) {
+    return this.prisma.coach.findMany({
+      where: tripId ? { tripId } : undefined,
+      include: { seatClass: { select: { id: true, name: true, basePrice: true } }, _count: { select: { seats: true } } },
+      orderBy: { label: 'asc' },
+    });
+  }
+
+  createCoach(dto: CreateCoachDto) { return this.prisma.coach.create({ data: dto, include: { seatClass: { select: { id: true, name: true, basePrice: true } } } }); }
+
+  async updateCoach(id: string, dto: UpdateCoachDto) {
+    const coach = await this.prisma.coach.findUnique({ where: { id } });
+    if (!coach) throw new NotFoundException('Coach not found');
+    return this.prisma.coach.update({ where: { id }, data: dto, include: { seatClass: { select: { id: true, name: true, basePrice: true } } } });
+  }
+
   async createSeatBatch(dto: CreateSeatBatchDto) {
     const coach = await this.prisma.coach.findUnique({ where: { id: dto.coachId } });
     if (!coach) throw new NotFoundException('Coach not found');
@@ -16,6 +33,7 @@ export class FleetService {
     await this.prisma.seat.createMany({ data: seats, skipDuplicates: true });
     return { created: seats.length };
   }
+
   async getAnalytics() {
     const [totalServices, totalTrips, totalSeats, bookedSeats] = await Promise.all([
       this.prisma.trainService.count(), this.prisma.trip.count(),
diff --git a/apps/edr-passenger-api/src/modules/passengers/passengers.service.ts b/apps/edr-passenger-api/src/modules/passengers/passengers.service.ts
index 54222751e..c1121fbed 100644
--- a/apps/edr-passenger-api/src/modules/passengers/passengers.service.ts
+++ b/apps/edr-passenger-api/src/modules/passengers/passengers.service.ts
@@ -30,7 +30,7 @@ export class PassengersService {
           destination: { id: b.trip.destinationStation.id, name: b.trip.destinationStation.name, code: b.trip.destinationStation.code, city: b.trip.destinationStation.city },
           departureAt: b.trip.departureAt,
         },
-        passengers: b.seats.map((bs) => ({ fullName: bs.passengerName, seat: { number: bs.seat.label, coach: bs.seat.coach.label, class: bs.seat.coach.serviceClass } })),
+        passengers: b.seats.map((bs) => ({ fullName: bs.passengerName, seat: { number: bs.seat.label, coach: bs.seat.coach.label, class: bs.seat.coach.seatClassId } })),
       })),
     };
   }
diff --git a/apps/edr-passenger-api/src/modules/schedules/schedules.dto.ts b/apps/edr-passenger-api/src/modules/schedules/schedules.dto.ts
index 80638d5ae..b00aaa906 100644
--- a/apps/edr-passenger-api/src/modules/schedules/schedules.dto.ts
+++ b/apps/edr-passenger-api/src/modules/schedules/schedules.dto.ts
@@ -1,6 +1,5 @@
-import { IsString, IsDateString, IsInt, IsOptional, IsEnum } from 'class-validator';
+import { IsString, IsDateString, IsInt, IsOptional } from 'class-validator';
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
-import { ServiceClass } from '@prisma/client';
 
 export class CreateTripDto {
   @ApiProperty() @IsString() serviceId: string;
@@ -14,7 +13,7 @@ export class CreateTripDto {
 export class CreateFareRuleDto {
   @ApiPropertyOptional() @IsOptional() @IsString() tripId?: string;
   @ApiPropertyOptional() @IsOptional() @IsString() route?: string;
-  @ApiProperty({ enum: ServiceClass }) @IsEnum(ServiceClass) serviceClass: ServiceClass;
+  @ApiProperty({ example: 'seat-class-uuid' }) @IsString() seatClassId: string;
   @ApiProperty({ example: 45000 }) @IsInt() baseFareMinor: number;
   @ApiProperty({ example: '2026-01-01T00:00:00Z' }) @IsDateString() validFrom: string;
   @ApiPropertyOptional() @IsOptional() @IsDateString() validUntil?: string;
diff --git a/apps/edr-passenger-api/src/modules/schedules/schedules.service.ts b/apps/edr-passenger-api/src/modules/schedules/schedules.service.ts
index a97b54fd6..062e7f0df 100644
--- a/apps/edr-passenger-api/src/modules/schedules/schedules.service.ts
+++ b/apps/edr-passenger-api/src/modules/schedules/schedules.service.ts
@@ -26,14 +26,14 @@ export class SchedulesService {
     return this.prisma.fareRule.create({ data: { ...dto, validFrom: new Date(dto.validFrom), validUntil: dto.validUntil ? new Date(dto.validUntil) : null } });
   }
 
-  async getFare(tripId: string, serviceClass: string) {
+  async getFare(tripId: string, seatClassId: string) {
     const trip = await this.prisma.trip.findUnique({ where: { id: tripId }, include: { originStation: true, destinationStation: true } });
     if (!trip) throw new NotFoundException('Trip not found');
     const route = `${trip.originStation.code}-${trip.destinationStation.code}`;
     const rule = await this.prisma.fareRule.findFirst({
-      where: { serviceClass: serviceClass as any, validFrom: { lte: new Date() }, OR: [{ tripId }, { route }, { tripId: null, route: null }], AND: [{ OR: [{ validUntil: null }, { validUntil: { gte: new Date() } }] }] },
+      where: { seatClassId, validFrom: { lte: new Date() }, OR: [{ tripId }, { route }, { tripId: null, route: null }], AND: [{ OR: [{ validUntil: null }, { validUntil: { gte: new Date() } }] }] },
       orderBy: { validFrom: 'desc' },
     });
-    return rule ?? { baseFareMinor: 45000, currency: 'ETB', serviceClass };
+    return rule ?? { baseFareMinor: 45000, currency: 'ETB', seatClassId };
   }
 }
diff --git a/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.controller.ts b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.controller.ts
new file mode 100644
index 000000000..945834ac0
--- /dev/null
+++ b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.controller.ts
@@ -0,0 +1,40 @@
+import { Body, Controller, Get, Param, Patch, Post, UseGuards } from '@nestjs/common';
+import { ApiTags, ApiOperation, ApiBearerAuth, ApiParam, ApiResponse, ApiBody } from '@nestjs/swagger';
+import { SeatClassesService } from './seat-classes.service';
+import { CreateSeatClassDto, UpdateSeatClassDto } from './seat-classes.dto';
+import { JwtGuard } from '../../common/jwt.guard';
+
+@ApiTags('Seat Classes')
+@Controller('seat-classes')
+export class SeatClassesController {
+  constructor(private service: SeatClassesService) {}
+
+  @Get()
+  @ApiOperation({ summary: 'List all seat classes' })
+  @ApiResponse({ status: 200, description: 'Returns all seat classes with their coaches' })
+  listSeatClasses() { return this.service.listSeatClasses(); }
+
+  @Get(':id')
+  @ApiOperation({ summary: 'Get a seat class by ID' })
+  @ApiParam({ name: 'id', description: 'Seat class UUID' })
+  @ApiResponse({ status: 200, description: 'Returns seat class with its coaches' })
+  @ApiResponse({ status: 404, description: 'Seat class not found' })
+  getSeatClass(@Param('id') id: string) { return this.service.getSeatClass(id); }
+
+  @Post()
+  @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth')
+  @ApiOperation({ summary: 'Create a seat class' })
+  @ApiBody({ type: CreateSeatClassDto })
+  @ApiResponse({ status: 201, description: 'Seat class created' })
+  @ApiResponse({ status: 409, description: 'Seat class name already exists' })
+  createSeatClass(@Body() dto: CreateSeatClassDto) { return this.service.createSeatClass(dto); }
+
+  @Patch(':id')
+  @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth')
+  @ApiOperation({ summary: 'Update a seat class' })
+  @ApiParam({ name: 'id', description: 'Seat class UUID' })
+  @ApiBody({ type: UpdateSeatClassDto })
+  @ApiResponse({ status: 200, description: 'Seat class updated' })
+  @ApiResponse({ status: 404, description: 'Seat class not found' })
+  updateSeatClass(@Param('id') id: string, @Body() dto: UpdateSeatClassDto) { return this.service.updateSeatClass(id, dto); }
+}
diff --git a/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.dto.ts b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.dto.ts
new file mode 100644
index 000000000..d12fe0fb6
--- /dev/null
+++ b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.dto.ts
@@ -0,0 +1,24 @@
+import { IsString, IsInt, IsBoolean, IsOptional } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional, PartialType } from '@nestjs/swagger';
+
+export class CreateSeatClassDto {
+  @ApiProperty({ example: 'Economy Seat' })
+  @IsString()
+  name: string;
+
+  @ApiPropertyOptional({ example: 'Standard economy seating' })
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @ApiProperty({ example: 45000, description: 'Base price in minor currency units' })
+  @IsInt()
+  basePrice: number;
+
+  @ApiPropertyOptional({ example: true })
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}
+
+export class UpdateSeatClassDto extends PartialType(CreateSeatClassDto) {}
diff --git a/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.module.ts b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.module.ts
new file mode 100644
index 000000000..a7e8648e1
--- /dev/null
+++ b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.module.ts
@@ -0,0 +1,6 @@
+import { Module } from '@nestjs/common';
+import { SeatClassesController } from './seat-classes.controller';
+import { SeatClassesService } from './seat-classes.service';
+
+@Module({ controllers: [SeatClassesController], providers: [SeatClassesService], exports: [SeatClassesService] })
+export class SeatClassesModule {}
diff --git a/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.service.ts b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.service.ts
new file mode 100644
index 000000000..2e3998651
--- /dev/null
+++ b/apps/edr-passenger-api/src/modules/seat-classes/seat-classes.service.ts
@@ -0,0 +1,40 @@
+import { Injectable, NotFoundException, ConflictException } from '@nestjs/common';
+import { PrismaService } from '../../common/prisma.service';
+import { CreateSeatClassDto, UpdateSeatClassDto } from './seat-classes.dto';
+
+@Injectable()
+export class SeatClassesService {
+  constructor(private prisma: PrismaService) {}
+
+  private readonly coachInclude = {
+    coaches: {
+      select: { id: true, label: true, tripId: true, _count: { select: { seats: true } } },
+      orderBy: { label: 'asc' as const },
+    },
+  };
+
+  listSeatClasses() {
+    return this.prisma.seatClass.findMany({ orderBy: { createdAt: 'asc' }, include: this.coachInclude });
+  }
+
+  async getSeatClass(id: string) {
+    const sc = await this.prisma.seatClass.findUnique({ where: { id }, include: this.coachInclude });
+    if (!sc) throw new NotFoundException('SeatClass not found');
+    return sc;
+  }
+
+  async createSeatClass(dto: CreateSeatClassDto) {
+    try {
+      return await this.prisma.seatClass.create({ data: dto });
+    } catch (e: any) {
+      if (e.code === 'P2002') throw new ConflictException(`Seat class "${dto.name}" already exists`);
+      throw e;
+    }
+  }
+
+  async updateSeatClass(id: string, dto: UpdateSeatClassDto) {
+    const sc = await this.prisma.seatClass.findUnique({ where: { id } });
+    if (!sc) throw new NotFoundException('SeatClass not found');
+    return this.prisma.seatClass.update({ where: { id }, data: dto, include: this.coachInclude });
+  }
+}
diff --git a/apps/edr-passenger-api/src/modules/seats/seats.controller.ts b/apps/edr-passenger-api/src/modules/seats/seats.controller.ts
index a14a6a17f..558d4b3f6 100644
--- a/apps/edr-passenger-api/src/modules/seats/seats.controller.ts
+++ b/apps/edr-passenger-api/src/modules/seats/seats.controller.ts
@@ -1,5 +1,5 @@
 import { Body, Controller, Delete, Get, Param, Post, Query, UseGuards } from '@nestjs/common';
-import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
+import { ApiTags, ApiOperation, ApiBearerAuth, ApiParam, ApiQuery, ApiResponse } from '@nestjs/swagger';
 import { SeatsService } from './seats.service';
 import { HoldSeatsDto } from './seats.dto';
 import { JwtGuard } from '../../common/jwt.guard';
@@ -8,11 +8,29 @@ import { JwtGuard } from '../../common/jwt.guard';
 @Controller('seats')
 export class SeatsController {
   constructor(private service: SeatsService) {}
-  @Get('seatmap/:tripId') @ApiOperation({ summary: 'Get seat map for a trip' })
+
+  // ── Seat Map ──────────────────────────────────────────────────────────────
+  @Get('seatmap/:tripId')
+  @ApiOperation({ summary: 'Get seat map for a trip' })
+  @ApiParam({ name: 'tripId', description: 'Trip UUID' })
+  @ApiQuery({ name: 'coachId', required: false, description: 'Filter by coach UUID' })
+  @ApiResponse({ status: 200, description: 'Returns coaches with seats and seat class info' })
   getSeatMap(@Param('tripId') tripId: string, @Query('coachId') coachId?: string) { return this.service.getSeatMap(tripId, coachId); }
-  @Post('hold') @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth') @ApiOperation({ summary: 'Hold seats for 15 minutes' })
+
+  // ── Hold / Release ────────────────────────────────────────────────────────
+  @Post('hold')
+  @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth')
+  @ApiOperation({ summary: 'Hold seats for 15 minutes' })
+  @ApiResponse({ status: 201, description: 'Seats held successfully' })
+  @ApiResponse({ status: 409, description: 'One or more seats unavailable' })
   holdSeats(@Body() dto: HoldSeatsDto) { return this.service.holdSeats(dto); }
-  @Delete('hold/:holdId') @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth') @ApiOperation({ summary: 'Release a seat hold' })
+
+  @Delete('hold/:holdId')
+  @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth')
+  @ApiOperation({ summary: 'Release a seat hold' })
+  @ApiParam({ name: 'holdId', description: 'Hold UUID' })
+  @ApiResponse({ status: 200, description: 'Hold released' })
+  @ApiResponse({ status: 404, description: 'Hold not found' })
   releaseHold(@Param('holdId') holdId: string) { return this.service.releaseHold(holdId); }
 
   @Get('export/csv/:tripId') @UseGuards(JwtGuard) @ApiBearerAuth('JWT-auth') @ApiOperation({ summary: 'Export seats as CSV' })
diff --git a/apps/edr-passenger-api/src/modules/seats/seats.dto.ts b/apps/edr-passenger-api/src/modules/seats/seats.dto.ts
index a36d76f18..52136e9fa 100644
--- a/apps/edr-passenger-api/src/modules/seats/seats.dto.ts
+++ b/apps/edr-passenger-api/src/modules/seats/seats.dto.ts
@@ -1,9 +1,9 @@
-import { IsString, IsArray } from 'class-validator';
-import { ApiProperty } from '@nestjs/swagger';
+import { IsString, IsArray, IsOptional } from 'class-validator';
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 
 export class HoldSeatsDto {
-  @ApiProperty() @IsString() tripId: string;
-  @ApiProperty() @IsString() passengerId: string;
-  @ApiProperty({ type: [String] }) @IsArray() seatIds: string[];
-  @ApiProperty({ required: false }) fareQuoteId?: string;
+  @ApiProperty({ example: 'trip-uuid' }) @IsString() tripId: string;
+  @ApiProperty({ example: 'passenger-uuid' }) @IsString() passengerId: string;
+  @ApiProperty({ type: [String], example: ['seat-uuid-1', 'seat-uuid-2'] }) @IsArray() seatIds: string[];
+  @ApiPropertyOptional({ example: 'fare-quote-uuid' }) @IsOptional() @IsString() fareQuoteId?: string;
 }
diff --git a/apps/edr-passenger-api/src/modules/seats/seats.service.ts b/apps/edr-passenger-api/src/modules/seats/seats.service.ts
index 866d30cc3..0edef4ddf 100644
--- a/apps/edr-passenger-api/src/modules/seats/seats.service.ts
+++ b/apps/edr-passenger-api/src/modules/seats/seats.service.ts
@@ -7,18 +7,20 @@ import { Cron, CronExpression } from '@nestjs/schedule';
 export class SeatsService {
   constructor(private prisma: PrismaService) {}
 
+  // ── Seat Map ──────────────────────────────────────────────────────────────
   async getSeatMap(tripId: string, coachId?: string) {
-    const coaches = await this.prisma.coach.findMany({ where: { tripId, ...(coachId ? { id: coachId } : {}) }, include: { seats: { orderBy: [{ row: 'asc' }, { col: 'asc' }] } } });
+    const coaches = await this.prisma.coach.findMany({ where: { tripId, ...(coachId ? { id: coachId } : {}) }, include: { seatClass: true, seats: { orderBy: [{ row: 'asc' }, { col: 'asc' }] } } });
     return {
       coaches: coaches.map((coach) => ({
         id: coach.id,
         name: `Coach ${coach.label}`,
-        type: coach.serviceClass,
+        seatClass: { id: coach.seatClass.id, name: coach.seatClass.name, basePrice: coach.seatClass.basePrice },
         seats: coach.seats.map((s) => ({ id: s.id, number: s.label, status: s.status, kind: s.kind })),
       })),
     };
   }
 
+  // ── Hold / Release ────────────────────────────────────────────────────────
   async holdSeats(dto: HoldSeatsDto) {
     const expiresAt = new Date(Date.now() + 15 * 60 * 1000);
     const hold = await this.prisma.$transaction(async (tx) => {
diff --git a/apps/edr-passenger-api/src/modules/segments/enhanced-seats.service.ts b/apps/edr-passenger-api/src/modules/segments/enhanced-seats.service.ts
index 57b6f2d2f..e7213cf6c 100644
--- a/apps/edr-passenger-api/src/modules/segments/enhanced-seats.service.ts
+++ b/apps/edr-passenger-api/src/modules/segments/enhanced-seats.service.ts
@@ -353,7 +353,7 @@ export class EnhancedSeatsService {
             id: seat.id,
             label: seat.label,
             coach: coach.label,
-            serviceClass: coach.serviceClass,
+            serviceClass: coach.seatClassId,
             row: seat.row,
             col: seat.col
           });