I had a hunch something like this would happen.

Captain Sir Geoffrey de Havilland, the designer of the Gipsy Moth aircraft flown nonstop from England to Australia in 1930 by Amy Johnson, was so far as is known to this correspondent not a relative of the American cartoonist Fontaine Fox, he of the justly celebrated Toonerville Trolley. I simply cannot imagine from whence this confusion arises. While the two men were indeed contemporaries (Sir Geoffrey, 1882 - 1965; Mr. Fox, 1884 -1964), there is no evidence that they ever met, much less that there was some longstanding rivalry between them. I suspect neither was aware of the other's existence.