Where was The Air Mail filmed?
1925 film by Irvin Willat
The Air Mail (1925) was filmed in Reno, Death Valley, Death Valley National Park and Rhyolite, 4 places named in its Wikipedia article, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 4 places. Each links to the sentence that says so.
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Landscapes & nature
Death Valley
United States
Desert basin in Inyo and San Bernadino counties in California, United States
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Landscapes & nature
Death Valley National Park
United States
National park in California and Nevada in the United States
“Filmed in Death Valley National Park and the ghost town of Rhyolite, Nevada, it was released in the United States on March 16, 1925.” Wikipedia
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Towns & cities
Reno
United States
City in and county seat of Washoe County, Nevada, United States
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Towns & cities
Rhyolite
United States
Ghost town in Nye County, Nevada