http://www.airforceheritageflight.org/
first link is general info about Heritage Flights

http://www.airforceheritageflight.or...eritage-flight
second link has a photo showing a Heritage Flight just about like what the one at the 500 should have for the various aircraft.

At least two previous competitors in the 500 have owned P-51 Mustangs, Johnny Rutherford and Bob Harkey. I was in the pits at IRP one evening about 20 years ago when a P-51 gave the place a fairly decent buzz. It was rumored to have been Harkey.