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TIL that on 9/11 a 5th airliner was presumed to be hijacked because the pilot changed the squawk code to 7500, which indicated a hijacking. Despite being a mistake, the airliner was diverted to Canada and was escorted there by US F-15s.

https://en.wikipedia.org/wiki/Korean_Air_Flight_085
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1fmosqj/til_that_on_911_a_5th_airliner_was_presumed_to_be/