October 16, 1942
Dear Dr. Mayo:
Before more time passes, I must tell you how much I appreciate the many courtesies Dr. Clark and I were shown during our visit in Rochester. As I believe I told you when we were there, we had originally planned on spending only one full day at the Mayo Aero Medical Unit, and you know that we found so much of interest and importance that we imposed on Dr. Boothby to the extent of remaining to carry on experimental work in the altitude chamber for nearly two weeks. The result of our work, however, will be of great value to us in our flying program. We are making important changes in our oxygen equipment as a result, and I think the experiments we carried on at Rochester will save lives in the future—when or how many it is, of course, impossible to know.
I shall write Mrs. Mayo to thank her for the very pleasant evening at your home. Also, I want you to know how much it meant to Dr. Clark and myself to have the opportunity of watching you operate that morning at the hospital. Thank you very much for arranging it.
Please let us know if you ever happen to be passing through Detroit and have time to go through our plant here at Willow Run.
With best wishes,
Charles A. Lindbergh