airlinemanagementsystem

Airline Management System (LLD)

Problem Statement

Design and implement an Airline Management System that allows users to book flights, manage passengers, handle seat assignments, process payments, and track bookings and flights.

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Requirements

• Flight Management: The system manages flights, each with a unique flight number, aircraft, source, destination, and schedule.
• Aircraft Management: Each flight is associated with an aircraft, which has a model and a set of seats.
• Seat Management: The system manages seat assignments and availability for each flight.
• Passenger Management: Passengers can be added, updated, and associated with bookings.
• Booking Management: Users can book flights, and the system tracks bookings, assigned seats, and passengers.
• Payment Processing: The system processes payments for bookings.
• Extensibility: Easy to add new features such as loyalty programs, meal selection, or multi-leg journeys.

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Core Entities

• AirlineManagementSystem: Main class that manages flights, bookings, passengers, and payments.
• Flight: Represents a flight with flight number, aircraft, source, destination, schedule, and seats.
• Aircraft: Represents an aircraft with a model and a set of seats.
• Seat: Represents a seat on an aircraft, with seat number, class, and availability.
• Passenger: Represents a user with ID, name, and contact details.
• Booking: Represents a booking, including user(s), flight, seat(s), and payment.
• Payment (in payment/): Represents a payment transaction for a booking.

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Class Design

UML Class Diagram

1. AirlineManagementSystem

• Fields: List flights, List bookings, List passengers, PaymentProcessor paymentProcessor
• Methods: addFlight(Flight), addPassenger(Passenger), bookFlight(Passenger, Flight, Seat, Payment), getAvailableSeats(Flight), getBookings(Passenger), etc.

2. Flight (in flight/)

• Fields: String flightNumber, Aircraft aircraft, String source, String destination, Date schedule, List seats

3. Aircraft

• Fields: String model, List seats

4. Seat (in seat/)

• Fields: String seatNumber, String seatClass, boolean isAvailable

5. Passenger

• Fields: int id, String name, String contactInfo

6. Booking (in booking/)

• Fields: int id, Passenger user, Flight flight, List seats, Payment payment

7. Payment (in payment/)

• Fields: int id, double amount, String method, PaymentStatus status

8. PaymentProcessor (in payment/)

• Methods: process(Payment), validate(Payment)

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Example Usage

AirlineManagementSystem system = new AirlineManagementSystem();
Aircraft aircraft = new Aircraft("Boeing 737", seatList);
Flight flight = new Flight("AI101", aircraft, "DEL", "BOM", new Date(), seatList);
system.addFlight(flight);

Passenger alice = new Passenger(1, "Alice", "alice@email.com");
system.addPassenger(alice);

Seat seat = flight.getAvailableSeats().get(0);
Payment payment = new Payment(1, 5000.0, "CREDIT_CARD");
system.bookFlight(alice, flight, seat, payment);

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Demo

See AirlineManagementSystemDemo.java for a sample usage and simulation of the airline management system.

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Extending the Framework

• Add loyalty programs: Track frequent flyer points and rewards.
• Add meal selection: Allow passengers to select meals during booking.
• Add multi-leg journeys: Support bookings with multiple connecting flights.

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