The ORGANIZATION@1 B-29 Superfortress was a four-engine propeller-driven heavy bomber that was flown by the ORGANIZATION@2 in MISC@1 and the MISC@2 , and by other nations afterwards .

The ORGANIZATION@1 B-29 Superfortress was a heavy bomber aircraft with four engines used by the ORGANIZATION@3 in MISC@1 , and by other countries ' military after that .
