Hi
If it is an American aircraft then it should be in one of the new 'Losses of US 8th and 9th Air Forces' books (by Stan D Bishop and John A Hey) - there are 2 volumes printed recently and the third and last one weill be printed later in the year.
Vol 1 is from June 1942 - December 1943
Vol 2 is from Jan 44 - March 44
Vol 3 will cover rest of the war.
If you have a slightly better date then let me know and I will look in my Vol 1 book (all I have at moment) and let you know if I can find it there
If it is a British bomber then it will be in one of the 6 volumes of 'Royal Air Force Bomber Command Losses of the second world war' by W R Chorley.
THere are also 3 volumes of 'Royal Air Force Fighter Command Losses of the second world war by Norman L R Franks (I have all of these)
My e mail is
timobeanie@cwgsy.net
Regards
TIm Osborne