Boeing B-29 Superfortress

The Boeing B-29 Superfortress is a retired American four-engined propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to its predecessor, the Boeing B-17 Flying Fortress, the Superfortress was designed for high-altitude strategic bombing, but also excelled in low-altitude night incendiary bombing and in dropping naval mines to blockade Japan.

Source: Wikipedia — Boeing B-29 Superfortress (CC BY-SA 4.0)