Good catch, Dave! According to the NASM site:
The NASM B-26B-25-MA nicknamed Flak Bait (AAF serial number 41-31173) survived 207 operational missions over Europe, more than any other American aircraft during World War II (A de Havilland Mosquito B. Mk. IX bomber completed 213 missions but this aircraft was destroyed in a crash at Calgary Airport in Canada, two days after V-E Day, see NASM D. H. 98 Mosquito). Workers at the Baltimore factory completed Flak Bait in April 1943 and a crew flew it to England. The AAF assigned it to the 449th Bombardment Squadron, 322nd Bombardment Group (nicknamed the 'Annihilators'), and gave the bomber the fuselage identification codes "PN-O." Lt. James J. Farrell of Greenwich, Connecticut, flew more missions in Flak Bait than any other pilot. He named the bomber after Flea Bait, his brother's nickname for the family dog.
This Marauder earned its nickname after just a few missions. Other bombers returned unscathed but Flak Bait invariably returned full of holes. "It was hit plenty of times, hit all the time," recalls Farrell. "I guess it was hit more than any other plane in the group.
So there is your answer, Lionel. I was meticulous with my questions to clarify what it was you were looking for. Now you have your answer. 8)
BTW, I am really a Colonel in the CAF.