2019-09-232019-09-231943-06-15https://repository.tcu.edu/handle/116099117/26846Map of the United States Air Transportation System Certified Routes as of June 15, 1943 including American Airlines System and Other Routes.25.5x22.5 paperPrior written permission from TCU Special Collections required to use any document or photographAviationAirportMidway AirportAmerican AirlinesDocument