Luxeuil - Saint-Sauveur (French: Base aérienne 116 Luxeuil Saint-Sauveur or BA 116) (ICAO: LFSX) is a medium size French Air and Space Force (Armée de l'air et de l'espace) base located near Luxeuil-les-Bains in the Franche-Comté region of France.

The Air Service, United States Army first set up a V Corps Infantry Liaison School in mid-1918, for which 99th Aero Squadron flew training missions from 1 July until 7 September 1918, before it joined V Corps Observation Group on Souilly Aerodrome; during its Luxeuil's time, the squadron dispatched its 3rd Flight to French 33rd Corps Aviation, flying from Corcieux airfield 19–24 July, and from Dogneville airfield 27 July - 28 August.

104th Aero Squadron had been flying from Luxeuil for the American V Corps since 8 August when it joined the newly formed group and followed its HQ to Souilly Aerodrome.

All those units flew tactical reconnaissance missions for the benefit of Army Corps, flying over the battlefield, reporting enemy troop movements as well as taking aerial photography and written observation of the area; artillery adjustments would also be made from the air.

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