I saved the game when my dropship was returning from a 'bad' mission (3 of mine died, no civilians - 3 of them lived), a UFO was spotted and I sent my crappy whatever they're called to it, it had a fuel pod and a raven thingy, weaponry consisted out of sparrowhawk missiles and the rotary gun (which was also mounted on my dropship).
I believe I saved quite close to the actual fight between the UFO and my intercept thingy - maybe it saved as half-dead or something?
Anyway, the console tries to load aircraft (2403), but says it can't because is 69 should be 3.
Obviously it's rather annoying to lose the safe game, but since I still have no clue how to shoot down UFOs not much is lost I guess.