B-29 Superfortress

 is a four-engine propeller-driven heavy bomber that was flown primarily by the United States in World War II and the Korean War.

On July 21, 1948, one of these aircraft crashed into Lake Mead. 333 years later, the aircraft becomes the object of interest of Boomers, who intend to raise it from the lake's bottom and restore it to working order, using parts from a museum airplane that was kept in Nellis Air Force Base. Restored, it is later used to bomb enemies of the Courier at the Hoover Dam.

Appearances
A B-29 Superfortress appears in Fallout: New Vegas.

Trivia
apperantly there was someone nearby to observe the plane emerge from the lake who mistook it for some kind of monster.