After WW I, as the aircraft were progressively more robust and carried heavier loads, a new type was developed: a transport aircraft, the most significant design being DC-3, which appeared in 1935 and remained in service for the next 100 years. Such aircraft were extremely significant in the upcoming war, but limitations of piston-driven engines made large scale aerial deployments immpossible. Even such extreme designs as 6-engine Me-323 were only able to carry up to 12 tonnes of cargo. The 1944 Allied Market Garden operation, the largest airborne operation of 20th century, failed partly because of inability to carry heavy equipment along with the troops. In 1963, the US introduced the jet-propelled C-141 Starlifter, which was to remain in service for the next 40 years. With the operational range of 5000 km, and the ability to carry tanks, it revolutionized the military aerial transportation. Although the C-141 didn't entirelly replace the older propeller-driven designs (like the C-130 Hercules), without it (and its larger counterpart, the C-5 Galaxy) the American military operations throughout the world would be severely hampered.