As an aside, I wish I could read the landing points on the TWA route. I’m pretty sure that the one I see there is Albuquerque. I remember when I was a kid and TWA still flew into Albuquerque (before it was the Sunport and SWA). You still had to walk out to the plane and walk up the stairs on the truck.
My first impression from that ad is that the artist had a problem with scale. It looks like either a tiny airplane about 20 feet over the waving cowpoke or a flying colossus high over the southwest.