The Douglas DC-7 is a four-engine propeller-driven airliner that was introduced in the late 1950s. It was designed for long-distance flights and could carry up to 105 passengers. The DC-7 was known for its speed and range, making it popular among airlines for transcontinental routes. First flown in 1953, the DC-7 was the last model in the Douglas DC series. It featured advanced technology for its time, including a pressurized cabin and improved aerodynamics. The aircraft played a significant role in the development of commercial aviation before being gradually replaced by jet airliners in the 1960s.