Try this game out. Very simple interface. Especially those aviation lovers!
Basically, what you have to do is operate an Airline. Establish routes, buy or lease aircraft and join alliances. It's still in it's development so features are slowly being introduced as the game progresses. It's currently in the 1950s and will continue till 2010. 1 Real time day = 1 Game month.
The game engine is quite realistic as the Ryan Air method of expansion really works out in game - operating from small airports instead of the major hubs.
I'm currently operating a 26 aircraft fleet