Don't try to figure out just how many rounds of machine gun fire an aircraft can absorb without depressurizing and crashing. Just sit back and enjoy the story, for heaven's sake. We viewers are now always required to BELIEVE the stuff we're watching; most movies are made to entertain; few are made to educate. If you take Air Force One for what it is, a wholly impossible and improbably bit of acting and producing and directing, then you won't be disappointed. It's not trying to be Shakespeare, so don't try to judge it as such.