I am a big fan of the work of Otis Shepard and his wife Dorothy Shepard. This one I believe is by his Dorothy and I absolutely love the bright colors, textures and style all over this illustration. There was a feature exhibition a few years back on the SFO airport on them which I was able to see. They were large images of their designs. MeanderingCraftily posted some photos. Hope you like it as much as I did, Enjoy!
Design: Dorothy Shepard | Year: 1949 | Photo: Javier García
this one’s by otis actually
You might be right, I can’t trace the source where I saw some guys discussing the same issue and believe the verdict was Dorothy. Let me know if you have any additional information I might be missing. Thanks!