Are you really so racially brainwashed that you imagine for one moment that the US would shoot down a civil airliner after it had declared a Mayday? Which planet do you inhabit?
Planet Earth, at a guess, on which most people would believe that.
Edited to add:
Yup. I've just described the scenario to another inhabitant of Planet Earth and asked "what do you think would have happened if the aircraft had flown towards JFK anyway insisting it was going to land despite being told not to?", and the answer I got was "they'd be shot down of course, well duh".