Oh this could get awkward. Wargaming.net recently announced World Of Warplanes to join World Of Tanks and the forthcoming World Of Battleships. But it seems another MMO already had a very similar idea. The imaginatively titled World Of Planes from Gaijin Entertainment was first announced in April, and has a debut trailer out today. In a world where you can't have The Elder Scrolls V: Skyrim and Scrolls without trouble, I'm impressed that this one hasn't kicked off yet. (Let alone Blizzard getting involved.) Also, World Of Planes' trailer is pretty.
So here's the World Of Planes trailer:
Which you can compare and contrast with the World Of Warplanes trailer: