http://www.airport-data.com/airport/photo/021583.html
Here is a photo of the documentation that the Western Museum of Flight has placed in front of the Boeing/Stearman N90840 on display. As you can see, they list the aircraft as having been N98040 when McQueen supposedly owned this aircraft. They've even reproduced the Department of Transportation application McQueen signed for c/n 75-1619, but with a tail number of N98040.
I didn't post this photo originally because of this discrepancy. Now I'm thinking maybe the original application had a typo on it, so everything else that has been produced about this plane afterwards has perpetuated this mistake. For N98040 is registered as a 1946 Piper.
I was just hoping someone out there could explain this discrepancy.