Six Oclock High
The Wrong Brothers used to have a show named the Flying Circus! Their tricks were flying on top of an airplane, which was also seen very rarely at those times. There years later they were flying their plane when they found themselves being attacked. They did not want to go down without a fight. Your gunner will start shooting automatically at your targets, so all you need to do is keep the plane in line. Your goal is to kill all your enemies. You will get a time bonus at the end of each, so being fast pays off. Make sure you do not get hit by the enemies, because they can destroy you. The health you remain with at the end also gives you some bonus points. Good luck!