Polaris Flight Academy, which opened on the field's grounds on July 15, 1941, trained cadets for the
Royal Air Force and the
Royal Canadian Air Force. (The school also used two auxiliary fields,
Liberty Field and
Victory Field.) The airfield had two hard-surfaced bituminous runways, one of 3,100' aligned NE/SW (05/23) the other of 2,950' aligned E/W (09/27). After the
Japanese attack of Pearl Harbor, the flight school began training cadets for the
United States Army Air Forces on 28 July 1942, being operated by the Polaris Flight Academy as a contract basic flying school (phase 1). The primary trainer in use was the
BT-13 Valiant. Known sub-bases and auxiliaries were: • Liberty (Lancaster) Auxiliary Field (No. 1) • Victory Field Auxiliary Field (No. 2) In 1944, the flight school changed its name to
Mira Loma Flight Academy. The airfield inactivated on 1 October 1945, and was declared surplus in 1946. Responsibility for it was given to the War Assets Administration. ==Current use==