These have been my stages, altough it spans a few sims, not just AH.
1. New to the game. Eager to learn, envious and doubtful you'll ever be as good as some you see in the game, but full of hope.
2. Really into the game. In a squad, big on base captures, coordinated play with other squads. Mainly bomber stuff.
3. Learning a bit about fighters, actually getting pretty good in them.
4. Uses fighters pretty much all the time. Loves the competition, takes part in all the King of the Hill stuff, makes sure the kill ratio stays up. On top of the world.
5. Becomes routine, live die, doesnt matter as long as you find a good fight. Often times log in, stare at the map in the tower. Finds ways to make the game more fun, pretty much enjoying squaddies is the highlight of the game.
If there is a 6th stage Im pretty sure it has something to do with a delete button. :/