Redesignated as the 489th Aero Squadron, it served as a support unit in France during World War I before returning to the US and being demobilized in 1919.

The squadron served in the Mediterranean Theater of Operations during World War II, earning two Distinguished Unit Citations for actions in North Africa and Sicily.

In November 1917 the 77th moved to the Air Depot at Garden City, New York for deployment to the American Expeditionary Force.

[1] The first 489th Bombardment Squadron was constituted in the Organized Reserve in March 1924 and allotted to the Ninth Corps Area.

[6] The 489th was one of the few Air Corps units in the Organized Reserve that possessed facilities, equipment and, aircraft between the wars.

The squadron was disbanded, along with all other Organized Reserve Air Corps units on 31 May 1942 and its remaining personnel were called to active duty individually.

As part of the 340th Bombardment Group, the squadron deployed to IX Bomber Command of the 9th Air Force in Egypt initially in March 1943 via Air Transport Command South Atlantic Route through the Caribbean, Brazil, Liberia, Central Africa, and Sudan.

In August 1943, the squadron was reassigned to XII Bomber Command of the 12th Air Force and participated in the Allied invasion of Italy in September 1943.

Activated as an A-26 Invader squadron in the postwar Air Force reserves in 1947; inactivated in 1949 due to budget reductions.

This article incorporates public domain material from the Air Force Historical Research Agency