The DC-7 is a four-engine propeller-driven airliner developed by Douglas Aircraft Company in the late 1940s. It was designed for long-distance flights and could carry up to 100 passengers. The aircraft featured advanced technology for its time, including a pressurized cabin and improved aerodynamics, making it popular among airlines. First flown in 1953, the DC-7 became known for its speed and range, allowing it to compete with jet airliners. It was the last piston-engine airliner produced by Douglas, with several variants introduced during its production run until 1958. The DC-7 played a significant role in the evolution of commercial aviation.