That was Chocks Away, a video that doesn't do it justice is http://www.youtube.com/watch?v=G0x5JbmU6HU. The dog fights were good and the missions had you shooting up balloons and moving trains too. You could link two machines with a serial cable and fly in the same airspace. A friend that worked at an Acorn dealer and I used to visit the shop after hours, he had keys, to play it until early morning, day after day, until we had completed them all. Great fun shouting at one another about who was taking on what in a dogfight. If the machine had an ARM 3 then the graphics had a bit more detail.