Something spotted whilst browsing issues of Photoplay magazine at the Internet Archive, a photo showing the US dirigible ZR1 drifting over the Cosmopolitan Studios in 1923 during the filming of Yolanda. I don’t doubt that the ZR1 really did fly over Hollywood although it looks here to be at an odd perspective (it’s also being completely ignored by the crowd of extras). This makes me think the magazine may have comped two separate photos for convenience, as famously occurred with the cover photo of Pink Floyd’s Animals album.
Searching around for details about the ZR1 turned up this 1931 poster by Georgii Kibardin exhorting Soviet citizens to build a fleet of airships in Lenin’s name. The Hindenberg disaster six years later put an end to this kind of enthusiasm.