Probably the most exciting were the times I was involved in designing something called the National AeroSpace Plane. The most disappointing may have been when it was cancelled, although the X-33 Program NASA is currently involved in has taken up the issue of SSTO again. Watch for news on it. Does Boeing own their own wind tunnels. NASA has wind tunnel at Ames, Langley Research Center in Virginia, and Lewis Research Center in Cleveland.
Many universities have small ones for teaching and research.
And the major companies, such as Boeing have a few. But companies don't usually have such sophisticated wind tunnels like NASA's because they are so expensive. NASA's are national assets for national research. Kelly, every test we do is for the benefit of our country. We are very much aware of who funds NASA, and we hope the US taxpayers think we are doing a good job.