Since you say there are no consistent captions, I'll thrown in my take. Sorry of this has all been said before.
The Texas Department of Transportation had an anti-litter campaign in which they employed a number of Texas-based individuals and organizations in various commercial spots. In 1991, the Confederate (now Commemorative) Air Force was the "actor" in one such commercial. The stills are from the first few runs of that commercial shoot. The shoot may have spanned more than one day and location, as there was some trial and error to make it all work. They ultimately decided to use just the B-17 with no P-51 or F4F.