War Thunder
One of my personal favourites on the list, War Thunder just came up on Steam. It’s a WW2 to Korean War Era flying arcade game/sim with an extremely accessible control scheme, in which the plane you control tries to best follow your mouse cursor wherever you put it. In addition, unlike other similar games like World of Tanks (in terms of game setup, not gameplay), you get to use multiple planes per multiplayer mission, allowing you to actually play more with not as many loading screens.
They’re also touting integrating the plane game with upcoming ground and naval battles, getting the most complete package in terms of large-ish scale battles yet.
It’s great. Play it.