A pretty sophisticated simulator for its time, Spitfire 40 can't really compete with the more recent MicroProse games - even Strike Force Harrier has quite a bit more depth about it. Takeoffs and landings are possible, as is dog-fighting (with a map to guide you during interceptions), but that's about it.
Nevertheless, it's still good fun blasting the Luftwaffe out of the air, even if there is just the one type of plane to bag. Other than a good looking cockpit display, it's all pretty basic stuff with enemy planes lacking detail, little in the way of ground objects to see and a frame update which hasn't aged at all well. For those of you wanting a very easy simulation to get into, with few of today's frills, it's good enough cannon fodder.