Flight search (one-way, round-trip, multi-city)

Fare comparison and live pricing

Real-time seat availability

PNR generation and e-ticketing

Flight rescheduling and cancellation

Booking status tracking and history

Online Travel Agencies (OTAs)

Travel agents and consolidators

Super apps and fintech platforms

Airlines or meta-search websites

Startups in the travel or mobility industry

→ API returns available flights, schedules, and fares
→ User selects flight and provides passenger details
→ API confirms booking, returns PNR, e-ticket, and invoice

Amadeus

Sabre

Travelport (Galileo, Worldspan)

Mystifly, TBO, Fareportal, etc.

Domestic flights (within India or any country)

International flights (across global destinations)
Some APIs specialize in one or the other, or offer both.