The North American P-51D Mustang was an American long-range fighter aircraft that was used extensively during World War II. It was one of the most effective fighter aircraft of the war, and it played a crucial role in the Allied victory. The P-51D was known for its speed, maneuverability, and its long range. It was also equipped with a variety of other features, including a retractable landing gear and a bubble canopy. The P-51D was used in all theaters of war, and it was particularly effective in the Western Front and the Pacific.