How airlines plan to fly a route – route planning.
From CNN:
https://www.cnn.com/travel/article/airline-route-maps/index.html
Pan Am Route Map from 1966:
World Airline News
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How airlines plan to fly a route – route planning.
From CNN:
https://www.cnn.com/travel/article/airline-route-maps/index.html
Pan Am Route Map from 1966: