The Palm Springs Air Museum is pretty much lit by massive skylights. Makes for bright tops and very dark bottoms of the planes you try to shoot. Also it leaves for dark corners and ceilings. HDR fixes that by blending frames set to expose the highlights and shadows in with that done for the middle tones.
To get these shots I shot "RAW" and bracketed +/- 2 stops...or EV in todays DSLR lingo. I used Adobe's CS5 to do the HDR file generation and tone mapping for "photorealism". If you look close at the images areas that were completely dark such as inside the engine cowl you now have detail. Ditto the tops of the planes that were blown out because of the direct light from the skylights above have detail too. It even helped bring out details from a black plane that was in the shadows. Its all good.