I found out 7500 is the standard code for a pilot to alert authorities that a hijacking is in progress. My son probably already knew this, he is a commercial pilot.
My wife and I watched this via Amazon streaming through our Roku. It is a curious project because essentially all the action takes place inside the cockpit, first as the pilot and copilot begin the flight very routinely, then the chaos when the hijackers gain access to the cockpit. Not everyone survives.
Although this is a fictional story great care was taken to research actual hijackings over the decades, as such it comes off very realistically. Very tense most of the time, it isn't "entertaining" but more eye-opening.
(Not to be confused with the 2014 horror movie "Flight 7500".)
