I'm not sure if this is an AI, a GUI or a graphics problem.
Some planes with manually-controlled multi-stage superchargers (e.g., the La-7) start the game with the supercharger set to the wrong setting in high altitude Quick Combat scenarios, causing the plane to produce black smoke trails until the player fixes the problem.
If you set the plane to autopilot before fixing the supercharger setting, either the AI-controlled plane doesn't switch to the proper supercharger stage or the smoke trails associated with a too-rich fuel mixture don't go away after it does so.
As a test to see what I mean, try setting up a QMB scenario with an La-7 starting at 5000 meters, then immediately switch to autopilot and then external view.
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