The Final Flight of the B-32 Dominator The last Dominator was scrapped in 1949, leaving little evidence behind of the aircraft type that had embarked on that fateful last mission over Tokyo. Here’s What You Need to Remember: The Boeing B-29 Superfortress heavy bomber achieved fame—and infamy—for its role in the atomic bombings of the Japanese cities of Hiroshima and Nagasaki. Developing the huge bombers, which could lug heavy bomb loads over long distances at high altitudes and speeds, amounted to the most expensive weapons program undertaken by the United States during World War II—more expensive even the Manhattan Project.