I've always thought it was both: the blue & white from the flag, and the right angles in a roundel from the aeroplane propeller. I mean, the colours in the flag are actually lozenge shaped, not square. If you go to Bavaria, you'll see those lozenges everywhere- other than on the noses of BMWs, I suppose. » 11/13/14 1:58pm 11/13/14 1:58pm