Hello Adriano:
Note that the
USAAF Chronology site lists US fighter losses for 17 Sept 1944 in support of MARKET GARDEN as 6 P47s and 7 P 51s (plus 3 and 2 respectively damaged beyond repair):
http://paul.rutgers.edu/~mcgrew/wwii...ml/Sep.44.html
As the fighters were assigned to attack flak positions and other ground targets, it seems reasonable to assume a number of the above losses were due to ground fire.
Anyway, the above indicates the total number of USAAF fighter losses that need to be accounted for.
Good luck.
Don