Landing
Landing is a bit trickier, and probably the most difficult aspect of "Air Raiders". What you need to do is descend to 0 feet. Do this slowly,taking the last 3000 feet one at a time. Cruise at 0 feet for a few seconds and your see the runway. Now do the most counter-intuitive move in a flight sim video game ever. Push the joystick into a dive (up), until almost the whole windshield is filled with horizon. Then release it. You have landed. You will be given ammunition equal to the number of "hits" you had this sortie, and if it exceeds 10, you will be allowed to take off again.
Taking Off
This is probably the easiest thing to handle in Air Raiders. To take off, press the fire button and wait a few seconds while your aircraft gains ground momentum. When you are going fast enough, pull back (down) on the joystick, and your aircraft will begin to climb.