Techie stuff leaves me pretty cold (though having flown a plane with GPS for the first time recently, I can see that I could be converted!).
I do get a buzz of achievement on the occasions (still all too rare

) when the aviation, navigation, and communication all seem to come together in perfect harmony.
But the main reason I fly is the same reason I dive: the ability to move in three dimensions and to have the privilege of seeing things that most other people never will. I never knew rainbows were circular when seen from the air. Ground-bound folks only get half the picture...