[2024] In Patch 14.2 Riot officially confirms that the correct key for flash is F

https://preview.redd.it/mbeficm83bec1.png?width=1209&format=png&auto=webp&s=53d6e704759793cc30dc6ea807a9c6e091f38ac0

https://www.leagueoflegends.com/en-us/news/game-updates/patch-14-2-notes/

Riot confirms F is indeed the flash key. This (correct) notion is supported by F-for-flash players such as the entire T1, DK, GENG rosters, BeryL, and Caps (and most of the KR server apparently).

Conversely, most of KCorp have flash on D. Coincidence?