John H. Luckadoo, the last surviving pilot from the storied 100th Bombardment Group, a war-battered unit of B-17 heavy bombers that flew missions deep over German-held territory during World War II, died on Sept. 1 in Dallas. He was 103.

His daughter, Elaine Abbott, said the death, in a hospice facility, was from congestive heart failure.

Mr. Luckadoo, known as Lucky, was just 19 when he enlisted in the Army Air Forces soon after the Japanese attack on Pearl Harbor triggered the United States to enter World War II.

He was assigned to fly B-17s, the military’s new long-range heavy bombers, which were designed to travel from southeast Britain into Nazi-occupied Europe to attack submarine pens, factories, rail yards and, eventually, German cities.

After more than a year of training, he flew his first mission in June 1943. By then his unit, a part of the Eighth Air Force, had earned the nickname “the Bloody 100th” because, even in a campaign that saw extensive losses of planes and crews, it stood out for its deadly turnover: During its 306 missions, the unit lost 757 men and 229 planes.