Air travel wasn’t always such an unpleasant chore. A hefty new coffee table book, “Airline Visual Identity” (Callisto Publishers, $400) by Matthias Hühne, showcases airline advertisements from 1945 to 1975, an era when flying was actually fashionable. The spirit of tÂhe posters changed over the decades, along with the advertising industry itself. In the early 1940s, the designs were more romantic, holding out air travel as a luxury experience. As the ad industry gained momentum in the 1960s and air travel expanded, the posters became more sleek and self-consciously modern. These days, stylish airline ads seems to have...