Frost BAD!!!
I am a pilot and I can tell you that frost can be just as bad as ice on a wing. The frost will kill the lift by creating thousands of small vortices in the air as it passes over the wing. You wouldn't think so from looking at it but it will.
Ice, on the other hand, changes the aerodynamics of the wing in unpredictable ways and can cause the wing to stall with really bad results.
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