You have to go back to around 2003 for the original Planeside game from Sony Online Entertainment, but the wait for the sequel is almost over and the developers have released a little teaser video that shows mainly air combat game play and to be honest, it looks brilliant! The developers state that they are still in the early stages, but for those who simply cannot wait, there is a section where gamers can register for beta testing.
This is a little bit about what this cool looking game has to offer;
The sequel to the landmark MMO FPS has been revealed and is bigger and better than ever. PlanetSide 2 is a massively multiplayer online first person shooter that delivers truly epic, massive combat on a scale never before seen in stunning, breathtaking detail. Battles wage with literally thousands of players aligning with one of three unique factions in intense land, air and vehicle game play where the fight for territory is more than a victory, its survival.
Source [Geeky Gadgets]