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Description
In the early 1970s, one of the hot competitions in the aviation industry was the rivalry between two new widebody trijet airliners, the Douglas DC-10 and the Lockheed L-1011 Tristar. The DC-10 was cheaper to build and sold more planes, while the Tristar was more sophisticated and sold fewer planes. As of today, both planes have been retired from most airlines. These models of Douglas DC-10 demonstrator N10DC and a Lockheed L-1011 Advanced Tristar prototype at the Smithsonian National Air and Space Museum's Steven F. Udvar-Hazy Center (Chantilly, Virginia) show the external differences between the planes. I imagine the planes were even more different inside.

Description
In the early 1970s, one of the hot competitions in the aviation industry was the rivalry between two new widebody trijet airliners, the Douglas DC-10 and the Lockheed L-1011 Tristar. The DC-10 was cheaper to build and sold more planes, while the Tristar was more sophisticated and sold fewer planes. As of today, both planes have been retired from most airlines. These models of Douglas DC-10 demonstrator N10DC and a Lockheed L-1011 Advanced Tristar prototype at the Smithsonian National Air and Space Museum's Steven F. Udvar-Hazy Center (Chantilly, Virginia) show the external differences between the planes. I imagine the planes were even more different inside.