DCS (Digital Combat Simulator) – one of the most difficult military aircraft simulators around. Just learning how to start the engines and take off is considered quite an accomplishment. Players are often known to have amazing setups like this:

An online group of friends call Grim Reapers do various amazing battles and competitions together using DCS. They’re quite a funny, and talented crew. Here’s a pretty good clip of them doing runs through a canyon full of AA:

If that doesn’t impress you, here’s an absolutely amazing competition to land their planes on an aircraft carrier. Carrier landing in game is known to be unbelievably difficult in the best of conditions, but these guys ramp the difficulty up to 11 and beyond…

Give their videos a watch. They’re pretty awesome.