During World War II, the air over the continental United States was a virtual third front. The little-known statistics are alarming: the Army Air Forces lost more than 4,500 aircraft in combat against Japanese army and naval air forces in the war. During the same time, the AAF lost more than 7,100 aircraft in the United States to accidents in training and transportation. Such accidents claimed the lives of more than 15,530 pilots, crewmembers and ground personnel, and the stories of their deaths are largely forgotten. This work chronicles the 6,350 known fatal AAF aircraft accidents that occurred in the continental United States from January 1941 through December 1945. Each crash summary, based on official records, provides details such as crash location and cause, the people involved and the type and number of aircraft. An aircraft serial number index, a record of AAF aircraft still listed as missing, crash statistics and a directory of AAF stations in the United States are included.