Walter Nowotny was an Austrian-born fighter ace of the Luftwaffe in World War II. He is credited with 258 aerial victories—that is, 258 aerial combat encounters resulting in the destruction of the enemy aircraft—in 442 combat missions. Nowotny achieved 255 of these victories on the Eastern Front and three while flying one of the first jet fighters, the Messerschmitt Me 262, in the Defense of the Reich. He scored most of his victories in the Focke-Wulf Fw 190, and approximately 50 in the Messerschmitt Bf 109. Nowotny scored an "ace in a day" on multiple occasions, shooting down at least five airplanes on the same day, including two occurrences of "double-ace in a day" in mid-1943.