Fanastic machinery i.e. cool aircraft. Great feeling of satisfaction from any particularly nice segment of flying, be it a good turn, take off, landing etc. The problem solving aspect. Reading the map, and having the sense of flying above it.
The solitary aspect of being up in the air, particularly in gliding.
Gliding especially, now evokes an emotion in me like being in love with a wonderful girl, an unconditional and overwhelming love.
I hope I can always fly.