Air Busan says web and mobile check-in is available on all domestic routes and international departures from Korea or Japan, except Guam. For Japan departures, the service is restricted to Korean nationals aged at least 19. International online check-in opens two days before departure and closes 90 minutes before departure; domestic check-in closes 30 minutes before. Some passengers, including people travelling with pets, children travelling alone and those requiring wheelchair assistance, must check in at the airport counter. Even with a mobile boarding pass, checked baggage must be surrendered at the counter before security. Nationality and entry requirements can create additional exceptions.