Algodoo

This is just about the most simple way of flying ever. The rudder on the back is much lighter than the rest of the aircraft, so when the aircraft gets going fast the rudder wants to be as far back as possible. It's a little awkward to fly, and you need to use the thruster to steer, but it works pretty well for how simple it is.

Up/Down Arrow Keys - Rudder Control
Right Arrow Key - Thruster