Camouflage, if you have not looked at the WW2OL site yet, you should. Then you will see that they put a lot of emphasis on the A2A part and the flight model.
However, it is clearly a game that emphasis a WW2 teather, with a lot of variations in units you can man - in air, on ground and at sea. A game like that will attrackt players from all those games that specialises on one of those areas, because the variation is fun, and one has to expect a huge number of players.
Even I, who prefer the A2A game, is attracted by the great number of different targets this represent. I sure do also see the challenge of flying cover for ground forces like infantry and other units. And, on the other side, attacking the same units.
If the flight modell in WW2OL is good, comparable to AH, the WW2OL sure will seem to offer more value. To me the WW2 teather will be such a value.
I like AH, and that is why I would like AH to evolve in a way that makes me stay. However, I and other hardcore players sure are keeping a close eye on what goes on outside AH.