I remember that Mustang Air Classics cover.
Another of his great AC covers was a Corsair shot using the scissor method that John describes. I have heard Budd speak at seminars at OSH about the technique.
Most of today's air-to-air photographers of vintage aircraft owe something to Budd. He worked out most of the techniques still being used. A lot of pics we see published today are just Budd's pics with a different plane in them.
He now has a site called airbum.com and he runs the magazine Flight Journal. However I suspect the rights to many of the great old pics we are talking about are owned by Challenge and so Budd cannot publish or sell them. He also fancies himself a novelist and political blogger now, but he would be better off sticking with photography and airplanes!
The version of the P-40 poster that I have has the planes stacked more vertically than the ones we have seen, and is my favorite from the shoot. I do have the AC article with black and white versions of several of the others, including the 3-out-the-tail.

August