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Re:A Grumman F11 Tiger Shot Itself Down by I_Byte on Thursday August 10, 2023 @07:00PM (#37082804)
This article, while not specifically about the euphemism, details it's origin and use among pilots.

https://captain-al-speaking.com/2018/12/06/flying-west/

Re:A Grumman F11 Tiger Shot Itself Down by xtiansimon on Friday August 11, 2023 @08:30AM (#37087944)
Going to the west as euphemism for death is mentioned on the History of Egypt Podcast (that’s Ancient history, if you didn’t guess).