The term Immelmann turn, named after German World War I Eindecker fighter ace Leutnant Max Immelmann, refers to two different aircraft maneuvers. In World War I aerial combat, an Immelmann turn was a maneuver used after an attack on another aircraft to reposition the attacking aircraft for another attack. In modern aerobatics, an Immelmann turn is an aerobatic maneuver that results in level flight in the opposite direction at a higher altitude.