Looks like it might be too simple at first, but it's totally addicting.
Basically you pilot a plane alongside 5-10 or so other players. Your team is either trying to blow up the enemy's base using bombs, to score on their goal in Plane Ball (with passes, interceptions, etc. Very fun), or to just win in a straight up deathmatch. The gameplay is very straightforward, but once you start playing the contest of it is so addicting that you can't put it down.
There are 5 planes and I think 25 different perks that you can swap out to tweak your play style. In the demo you can play the first 2 planes and something like 6 or 7 perks. Go find the demo, give it a shot. I know it's a small game but it's a perfect timekiller, kinda like a flash game on steroids.