Messerschmitt Bf 109G-10 During WWII, the Bf 109 was the backbone of the Luftwaffe fighter force, serving on all fronts and also in the air forces of its European allies. Even though the superior Fw 190 began to replace the Bf 109 in some units as early as the summer of 1941, production of the Bf 109 actually rose until the closing months of the war and it remained the most numerous Luftwaffe fighter. | National Museum of the U.S. Air Force