Today’s Poster is a 1930s example from Det Danske Luftfartselskab (DDL, Danish Air Lines) DDL was merged in 1951 into the Scandinavian Airlines System (SAS).
The passenger looking out of the window trope has been used a lot, but I think this is unusual in having an aircraft outline overlay. It’s also one of the then-common trimotor types – though not precise enough to be more specific. The passenger fits well into the period design, but her lack of a hat, and clothing makes her look as though she’d fit in a modern scene too. I’ve not been able to identify the artist (can you help?) but their signature seems to be in 1936.
James Kightly, Vintage Aero Writer.
Another find on 1st Dibbs here.