Where was The Lion Has Wings filmed?
1939 film
The Lion Has Wings (1939) was filmed in RAF Mildenhall and RAF Hornchurch, 2 places named in its Wikipedia article's Production section, in the United Kingdom. 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 Production section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
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Landmarks & buildings
RAF Mildenhall
England
Airport in the United Kingdom
“The addition of footage that was shot at operational bases, RAF Hornchurch, Hornchurch, Essex, and RAF Mildenhall, Suffolk, England, combined with studio work at Denham Studio, Denham, Buckinghamshire, UK, lent an air of authenticity to the production.” Wikipedia
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Landmarks & buildings
RAF Hornchurch
England
UK Royal Air Force airbase