>Has there ever been an explanation why the hijackers risked conspicuously attending flight schools under the noses of the US authorities, rather than, say, abs

>Has there ever been an explanation why the hijackers risked conspicuously attending flight schools under the noses of the US authorities, rather than, say, absolutely any other country in the world? Because there are more flight schools in the US than anywhere else, and if you want to do some flying in US airspace, those are in the best position to teach how it works, what controls there are, how to avoid them, etc.