The Airline Booking System is a web-based application that allows users to search and book flights offered by various airlines. The system is divided into three parts: the user's browser, the React front-end, and the SpringBoot back-end. The React front-end is further divided into a portal and three back-end management systems. The SpringBoot back-end is composed of multiple systems, including a Eureka server, a city list server, and three airline company sub-servers.

• Users can search and book flights offered by various airlines.
• Three back-end management systems allow airline company personnel to manage their services.
• The portal allows users to register, log in, view flight schedules, and book flights.
• The city list server helps other services query city information and protects data privacy.
• The Eureka server is a registry center that all the systems register on.
• The booking system allows users to book flights, and airline company personnel to approve or reject the booking.

• React: A JavaScript library used for building user interfaces.
• SpringBoot: A Java framework used for building enterprise applications.
• MongoDB: A NoSQL database used for storing and managing data.
• Eureka: A registry center used for service discovery.
• Maven: A build tool used for managing dependencies.
• Servlets: A Java API used for handling HTTP requests and responses.
• JSP: A Java technology used for dynamically generating HTML, XML, or other types of documents.

• Utilized Maven for building and managing dependencies.
• Utilized Servlets for handling user requests and responses.
• Implemented MongoDB to store data and used converters to convert between documents and session/book classes.
• Created a filter to control user login and used a map to determine which actions require login.
• Utilized JSP to display web pages and implemented error and success pages.
• Split time into one-hour intervals using a Session Hourly Intervals class.
• Achieved complete functionality for booking flights from availability to confirmation, rejection, or cancellation.

The Airline Booking System is a fully functional web application that provides a comprehensive solution for booking flights offered by various airlines. The system is built using modern technologies and provides a user-friendly interface for users and airline company personnel.