Very little. Just some cropping, minor brightness adjustment, and a big saturation boost. I like to shoot with somewhat "flat" looking images (low contrast, saturation, slightly underexposed) then I go into PS and bring out the colors.
Here is an unedited example of the wing shot.
I took this one while flying in from Minneapolis in December 2009 during final approach into Amsterdam Schiphol and flying on a Delta A330-300. (Northwest Airlines at the time)
Here are a few more unedited shots. (And shot normally without reduced saturation)
(Same plane as the engine shot.)
And a couple more edited shots. (Sorry about the compression, I linked them from FB)