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Of course a lot of superstition and legend goes along with All Things Airborne as well as afloat, so there are many legends that these anomalies were "something else" - gremlins, ghosts, or even aliens. The pilots who experienced these anomalies and bravely took to the air again became known as Foo Fighters which is where the Seattle band got it's name . . .
Urban Legend? It's all a bunch of foo anyway, one good pass across the Internet puts the foo next to the bar . . . .