The 42nd Expeditionary Airlift Squadron, sometimes written as 42d Expeditionary Airlift Squadron, is a provisional unit of the United States Air Force, assigned to United States Air Forces in Europe to activate or inactivate as needed. Originally constituted as the 42nd Transport Squadron in 1942 and redesignated the 42nd Troop Carrier Squadron the same year, it received its present designation in 2007. It was last active at Ramstein Air Base, Germany in 2009.