The B-29 was the first mass-produced pressurized aircraft. Boeing 307 was an earlier passenger airliner, but only 10 were built. Lockheed Constellation was the

The B-29 was the first mass-produced pressurized aircraft. Boeing 307 was an earlier passenger airliner, but only 10 were built. Lockheed Constellation was the first mass produced pressurized airliner.