I am not the owner of this mod.

Controls:

Keyboard:
Up - pitch down
Down - pitch up
Left - roll left
Right - roll right
L - launch
P - power
B - brake

Gamepad:
Left Thumbstick - pitch & roll
A - launch
Right Trigger - power
Left Trigger - brake

Flight Stick:
All of the above are assignable.

Notes:
It conserves momentum too well, so once you've gained altitude you will gain a lot of speed back on your descent.

Use of power and brake can keep you aloft indefinitely.