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.
well you should get to the airport 3 hours before your flight. but the check in desks have opening times for you to check in on that flight , so if you want to check in before anyone else (be the first to check in...) get there 3 hours and about 45 minutes before your flight. and wait till the check in desk opens.