TIL that most airlines never use a flight number again if that flight has a fatal crash, except for American Airlines, which keeps using flight #1 despite three major crashes.

https://en.wikipedia.org/wiki/Flight_number#Flight_number_changes
https://www.reddit.com/r/todayilearned/comments/15p5nem/til_that_most_airlines_never_use_a_flight_number/