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.
How early should I arrive to the airport prior to my flights departure? You are encouraged to arrive at the airport two hours prior to flight departure for domestic travel and three hours for international travel. This allows time for parking and shuttle transportation, airline check-in, obtaining a boarding pass, and going through the security screening process, which includes screening of your carry-on baggage.