Are you willfully ignorant or stupid? In all your discussion about having papers and flying in legally you ignore the elephant in the room (probably because you cannot understand it) that people who overstay their Visa's are here illegally just like people who walk or wade into this country. On average 40% of undocumented overstay their Visa's. I know plenty who are here that are undocumented. One I know even has his own plane.