How does a Flight API handle connecting flights and layovers?

A flight API handles connecting flights and layovers by combining multiple flight segments into one complete itinerary. It collects real-time schedules, fares, seat availability, airline details, terminal information, baggage rules, and connection times from airlines, GDSs, NDC platforms, or other suppliers. The API checks whether each connection meets the airport’s minimum connection time and presents valid options to the traveler. It also displays layover duration, departure and arrival terminals, aircraft changes, overnight stops, and whether baggage must be rechecked. During booking, the Flight API validates the entire itinerary, confirms seat availability for every segment, and calculates the total fare, taxes, and applicable fees. If a schedule changes or a flight is cancelled, the API can return updated itinerary information and alternative options, depending on the supplier. This process helps travel websites offer accurate connecting flights, clear layover details, and a smoother booking experience for customers across domestic and international routes.