Originally Posted by BebackNaminute

Guidelines for Checking In on International Flights (including Canada/Mexico/Caribbean/Puerto Rico)
Recommended arrival time for international flights is at least 2 hours prior to departure (3 hours if departing from London-Gatwick or Frankfurt airports). All reservations and advance seat assignments may be cancelled if the passenger has not checked in and received a boarding pass at least 60 minutes prior to departure and may not be eligible for denied boarding compensation if they are not onboard the aircraft at least 30 minutes prior to departure. If you are checking luggage, you must do so no later than 60 minutes for international flights, including Canada, Mexico, Puerto Rico, the Caribbean, Europe and Asia.