Endeavor Air is an American regional airline headquartered at the Minneapolis–Saint Paul International Airport in Minneapolis, Minnesota, United States. The airline is a wholly owned subsidiary of Delta Air Lines and staffs, operates and maintains aircraft used on Delta Connection flights that are scheduled, marketed and sold by Delta Air Lines.

Delta Connection is a brand name for Delta Air Lines, under which a number of individually owned regional airlines primarily operate short- and medium-haul routes. Mainline major air carriers often use regional airlines to operate services via code sharing agreements in order to increase frequencies in addition to serving routes that would not sustain larger aircraft as well as for other competitive or operational reasons.