Using the VeriFLY app, customers can upload documents to meet travel requirements, and American will accept the verification for flights operated from the airlineā€™s U.S. airports to eight countries. This is in addition to the carrierā€™s recent expansion to accept VeriFLY for international travel to any of Americanā€™s domestic airports.

Passport information isnā€™t required in order to make a reservation but must be provided and verified before boarding. You can provide passport details during the booking process at Southwest.com, after you book your flight online, during the online check-in process, or at the airport on your day of travel using a kiosk or at the ticket counter.
About The Service. IndiGo Web Check-In facility is meant for anyone with a confirmed reservation of one of IndiGoā€™s numerous domestic flights. Any passenger willing to avail this service can do so anywhere between 48 to 2 hours, prior to the departure of the flight. All that the passenger needs to do is visit the official website of the airline.
- Passengers travelling on international flights, your passport must be valid at least 6 months on departure date with valid visa (if required). - Passengers on international flights who have completed Online Check-in, Automated Check-in or Kiosk Check-in are required to present themselves at Self Service Check-in Counter at least 90 minutes
Online Check-in is available from 72 hours to 2 hours before departure for all international and domestic flights. Confirm your attendance on the flight, select your seat and save valuable time. The only thing a passenger need is a soft copy of the boarding pass on their smartphone or an internet connection and a printer for the boarding pass.
Boarding Procedure. 1. Arrive at the terminal. Check-in closes 1 hour before flight departure. Please arrive at the airport at least 2 hours before departure and complete check-in. The check-in closing time for codeshare flights operated by other airlines can vary from that of Korean Air flights.
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is online check in mandatory for international flights