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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.
The airlines have a cut-off time of 30 minutes prior to flight time in order to check in (we almost missd it once). To be safe, for domestic flights, we arrive at the airport between 1 hour to 1.5 hours prior flight time, which gives enough time to check in, and get through security lines. For an international flight, I would arrive 2 hours before flight time.