Don't you use it for jets?
(No Pun Intended)
No, I'm stuck with a strange key set I mapped out years ago, back in alpha, where I decided I liked up-down-left-right because it was easy to remember and I had never played a game that used w-a-s-d. In that process, jet got mapped to right control, and it kinda stuck. I also remapped all my build keys to Shift+Up/Down/Left/Right/;/. and Alt+Left/Right to rotate.