Interesting question. In RL I actually am a Helicopter Pilot. I have a commercial license and pick up work when i can. I like to also fly in SL because ... I can enjoy the views and perspective in SL as i would RL from above. There is something about the restraint of view an aircraft gives, while also giving a great view because of altitude. I'm not sure why i bother flying aroudn in SL. But there is certainly a them or roleplay there.
Also you can get away with launching rockets at someones building and not being killed or arrested. LOLOLOLOL