Hi all,
here's a link to a list of international airfields of 1931: http://www.pennula.de/airport/index.htm
Mostly European airfields, none in North America, but also some in Africa, Asia, Australia and South America. Quite a few maps - or rather simple sketches, but better than a mere list anyway.
More on the site's index, partiularly a list of all German and Polish commercial airfields (in German and Polish, respectively) and some maps: http://www.pennula.de/luftfahrtgeschichte/index.htm
Best regards,
Volker
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