until the 60s, airplane travel was so exotic and rarified that Frank Sinatra recorded an entire album about the experience (Come Fly with Me), and TWA had the coolest advertising billboards with two-fifths scale model with a working propeller Constellations on top

sometimes it was a cool business district billboard, and one example was 8 stories high in Times Square

https://www.considerable.com/entertainment/retronaut/retro-twa-posters/
https://urbancentury.tumblr.com/page/26