Ryan Air Field rose from the desert in just months in 1942, after the U.S. entrance into World War II. Under orders from the U.S. Government, Ryan Aeronautical School in San Diego, which trained pilots for the U.S. Army Air Corps, moved its operations inland under threat of Japanese invasion.ย  Ryan built two bases, one at Ryan Field west of Tucson and one in Hemet, Calif. The air field included "paved runways, aprons, hangars, barracks, mess hall, classrooms and recreational facilities," according to the Tucson Airport Authority. It closed in Sept. 1944, after training 6,000 pilots.

The other Tucson-area flight training bases in WWII were Marana Air Base (now Pinal Airpark) and Davis-Monthan AFB.

Ryan Field is now a civil aviation airport managed by the Tucson Airport Authority.