You might not be able to check in using the app, if: Your first flight is not operated by American Airlines. You're traveling with a pet, weapon or firearm. You're an unaccompanied minor.
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If you don't check in, you won't receive a boarding pass that allows you to board the plane, and your seat might be given up to a standby passenger. The check-in process also confirms your traveler details like your passport information and frequent flyer number.
You need to show additional documentsAnother reason that your boarding pass may say “see agent” is that certain travel documents need to be verified. If you had not previously selected a seat, some airlines cannot automatically issue a boarding pass with a seat assignment until the documents are checked.
Flight information. Paper ticket (less and less common), OR. E-ticket with a confirmation number—usually sent via email if ticket is purchased online or through a travel agency, OR. Printed itinerary with a confirmation number.
If you can't check in online—some airlines require you in-person check in for certain flights, especially when flying internationally—make sure you get to the airport with adequate time before your flight, as you might need to wait in a long line.
Saving time on the long airport check-in lines. Allowing you the option to choose your seats before even reaching the airport. The possibility of paying a lower fee checked baggage than you would if you paid in-person at the time of airport check-in. Skipping the line!
Check-in timesYou can check in online or from the app starting 24 hours before and up to 45 minutes before your flight (90 for international). To check bags or check in at the airport, you must be there a certain amount of time before scheduled departure: Within the U.S. – 45 minutes.
For a short-haul flight where you are only taking hand luggage, checking in online saves a lot of time and is therefore much better than checking in at the airport. If, on the other hand, you have to check in bulky luggage, it is better to use the classic check-in at the airport for security reasons.
The airline holds onto the good seats for as long as possible in the hopes of selling them, so those loathsome middle seats are often allocated first. If you don't want to pay, you have a better chance of getting a seat with extra legroom if you check in later.
For a short-haul flight where you are only taking hand luggage, checking in online saves a lot of time and is therefore much better than checking in at the airport. If, on the other hand, you have to check in bulky luggage, it is better to use the classic check-in at the airport for security reasons.
Generally speaking, most airlines advise that you arrive at the airport at least 2 hours prior to a domestic flight, and at least 3 hours prior to an international flight. That said, there are many factors to consider that will help you decide how much time you should budget for at the airport.
Depending on the requirements of airport authorities, you will need to present a mobile boarding pass, a paper boarding pass printed out by you or a paper boarding pass picked up from the check-in desk.