postal service

Black and white Map from 1924 created by the US Post Office Department showing the First Transcontinental Air Mail Route stretching from New York to San Francisco.

Using Giant Arrows to Guide Airmail Flights

March 19, 2022October 20, 2021 by Caitlin Dempsey

The Transcontinental Airway System was created to aid midnight airmail trips long before radio navigation and Global Navigation Systems (GPS) were invented to assist in air flying.