Twentieth Century Air Travel
The advent of air travel in the 20th century produced a new form of mapping, the air route map. Air route maps were similar to highway and railroad maps but with the sky as their territory, they were untethered by terrestrial limits.
Designers like the French artist Lucien Boucher made the most of these possibilities in his maps for Air France, as seen in the map reproduced on the back of the case. Other mapmakers were even more playful with projection, globe and spiral as the themes of the Scandinavian Airlines route map on the right.
A more scientific approach was taken by American Airlines in a series of maps explaining the science of air travel and the physical nature of the air itself.