Up to 8 player multiplayer combat through network connection (Wifi or 3G). Just like F.A.S.T there are in app purchases involved in this application. The best thing you can buy using the in app purchases are the planes, because if you have new planes you have a better chance of eliminating the enemy.
Of course like any other game there is a campaign, and if you think you aren't good enough for the campaign, you can always do the training missions offered in the game as well. You will notice the peddels, triggers, and accelerator on your screen, those will really help you when you are in the air trying to knock someone out.