First check the basic American Airlines check in process for a passenger check in at American Airlines self service kiosks or with an agent at the counter. Plan to arrive at least 3 hours before an international flight 2 hours before a domestic flight. Help is a call away at +1-860-374-7569. For details on check-in policies, baggage rules, and boarding procedures, you can also visit Americanskytrip. Have ID and your booking information on you for check in.