Royal Saxon Jagdstaffel 40, commonly abbreviated to Jasta 40, was a "hunting group" (i.e., fighter squadron) of the Luftstreitkräfte, the air arm of the Imperial German Army during World War I.
The unit would score over 54 aerial victories during the war, including three observation balloons downed.
[1] Jasta 40 was founded on 30 June 1917 at Fliegerersatz-Abteilung ("Replacement Detachment") 6, Grossenhain, Germany.
Jasta 40 began its combat operations on 15 August 1917, in support of Armee-Abteilung A.
The following month, it was assigned to the 4 Armee Front, supporting this formation from various French aerodromes until the Armistice.