Originally Posted by DougLikesBMW
By the way, BMW's CEO said in one of those factory tour shows that it was indeed the Bavarian Flag.
I should add that during a BMW research facility tour (Munich), we were told it was due to the airplane propellers. However, the next day when we went to the BMW museum, they called this a myth! and that it is derived from the Bavarian colors - which I do believe to be true
It was surprising that even inside BMW there seems to be debate (or misunderstanding) about this