Not quite sure what code in Aces High that causes this strange phenomena, but it needs to go away. It looks really odd...
I was showing Aces High to a friend and I was on the six of a P-38 - it was kind of a 'hold my beer' event to demonstrate how awesome this game is...except the Lightning started flip-flopping in front of me (stalled?) just as I was about to line up for a shot, my buddy (who is also a pilot) started to howl with laughter. It just looks weird and not a normal physics response for any aircraft. It's like they go from normal flying to full bore "I've lost my tail" falling spin, except that they're slow and spinning in the air in front of you.
Please, we need the beached trout syndrome to disappear...