According to Freeman's biography p.236
By February 1944 more than 100 9th Air Force Merlin mustangs were escorting 8th air Force bombers, destroying three to five times as many German fighters per sortie as the more numerous P-47s between January and March, Before the end of March Doolittle asked for all his p-47s and P-38s to be replaced by Mustangs as soon as possible.
P.239
the performance ofthe German twin-engined fighters was never adequate against day fighters, but the speed and manoeurability of the modified FW 190s an Me 109s had been impaired by the weight of their new guns and armour. Until the D-9 version of the former was available, belatedly re-engined with the Jumo 213, they could not compete with the Mustang.
And p.241
Monthly losses, which included most of the experienced German fighter pilots, averaged 450 in the first five months of 1944, only 246 of Germans's single-engined day fighters remained operational.
By February 1944 more than 100 9th Air Force Merlin mustangs were escorting 8th air Force bombers, destroying three to five times as many German fighters per sortie as the more numerous P-47s between January and March, Before the end of March Doolittle asked for all his p-47s and P-38s to be replaced by Mustangs as soon as possible.
P.239
the performance ofthe German twin-engined fighters was never adequate against day fighters, but the speed and manoeurability of the modified FW 190s an Me 109s had been impaired by the weight of their new guns and armour. Until the D-9 version of the former was available, belatedly re-engined with the Jumo 213, they could not compete with the Mustang.
And p.241
Monthly losses, which included most of the experienced German fighter pilots, averaged 450 in the first five months of 1944, only 246 of Germans's single-engined day fighters remained operational.