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For instance, American Airlines advises passengers to be at the airport two hours before flight time for international departures and 90 minutes for domestic flights. Also, there's an exception for flights to certain overseas destinations, which require that you check in earlier.
Dulles recommends arriving at the airport 2 1/2 to 3 hours before departure time for an international flight. I tend to leave myself 2 1/2 hours if my airline has allowed me to check in on-line, because then I only have to queue in the shorter, faster line to check my luggage and get my passport vetted.