Here's a LIFE magazine set of 40 period photographs of B-17s (and others) and related subjects. Many of these are in color, which is not common.
Notable is color photo #15:
"LIFE photographer Margaret Bourke-White sits atop the engine of the B-17 bomber "Flying Flit-Gun" in Northamptonshire, England, in the fall of 1942."
She appears to be posing while holding some flavor of a Rolliflex TLR (adorned with a crooked lens hood).
Also notable is b&w photo #28:
"The engine of an American B-26 Marauder bomber falls off after the plane was hit by ground fire over the French city of Toulon in 1942."
I've never seen anything quite like this before. Longtime photography writer Art Kramer ("View from Kramer") flew as a bombardier in the B-26 Willie the Wolf during WWII. He managed to take his camera along for the ride for some memorable pictures.