Here's the deal: Yes, your metabolism affects your size, and the faster your personal motor runs, the more calories you'll burn. But the truth is, a slow metabolism isn't the real reason you're packing on pounds. You are the reason.
As a general rule, arrive at the airport no later than two hours before your domestic flight is scheduled to depart. This is somewhat later than the typical suggestion of three hours for an international flight.
For international flights, we encourage you to be at the gate no later than 30 minutes before your scheduled departure. If you are departing from the following airports, please be advised that you are required to be at the gate at a specific time before departure, as additional security or documentation checks may be required: