On 7 April the construction of a new aerodrome at Sinzing was commenced to take care of additional squadrons moving in from the First and Second Armies in France, and for that same reason, the aerodrome at Weißenthurm was expanded.
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The Air Service, Second Army Air Service was activated on October 12 with Col. Frank P. Lahm as chief, and the Air Service, Third Army Air Service was created immediately after the armistice to provide aviation support to the army of occupation, primarily from veteran units transferred from the First Army Air Service.
The Third Army Air Service, under the command of Brigadier General William Mitchell was organized on 14 November as the Air Service component of Third Army.