Steve goes way back with these airplanes. Here's an excerpt from his reply to my e-mail:
"I was asked to attend the fly-in of the trio of World war II airplanes. Their P-51 is the model that I flew in gust load tests through storm clouds and ended up bailing out of it when the engine failed due to the large "g" forces put on it exacerbated by the fact that it is on the end of a cantilevered engine mount. We also had the A,D and H models at Langley. I got to fly the B,D,and H. I was considered an "expert" on P-51's and on December 6th, 1990 gave a General Electric series speech called "Riding the Mustang". My quotation at the time was that the P-51 was the best airplane I ever flew, that it was the best plane of WWII and it probably was the best airplane that ever was...The P-51B with the 109 canopy was the fastest of the lot. ...That just hints at who this man is and what he's done. If you would like to be exposed to more of his stories, have a look at his contribution to NASA's Oral History Project.
I was pleased to...get a ride in the B-24 and did so sitting the jump seat of the cockpit which brought back fond memories. I also got to crawl from tail gunners post to the bombadier's seat. They have done a great job of restoring and flying this 70 year old airplane and I wonder how much longer they can keep it "up". They might still be able to get parts but vibrating them for so many hours over so many years might take its toll.
Anyway, thanks for the email."