Fly in free mode or try to beat the highscore in timed mode.
You can perform several acrobacies including rolls, loops, low level flight, etc.
Catch flying powerups to increase engine power, maneuverability and more. But beware, there are powerdowns too!
left/right: nose up & down
How to unlock the additional planes:
fly as high as you can, until the plane go offscreen
make a Low Altitude x 50 combo