The Tiger Kingdom wrote:The P-51 looked sexier, had more kills, and got shot down less. Admittedly, the Thunderbolt was in service longer, but not by much.
The Thunderbolt was formidable, and had the ground-attack dimension that the P-51 lacked, but I think the Mustang was still the finest fighter aircraft America fielded during the War (and was a marvelous symbol of Allied cooperation at the same time).
The first Mustang Mk Is entered service in 1941 the first unit being 2 Squadron RAF. Due to poor high-altitude performance, the Mustangs were used by Army Co-operation Command, rather than Fighter Command, and were used for tactical reconnaissance and ground-attack duties.