In the early 1960s, the Boeing 707-300 and the Douglas DC-8-60 dominated the skies. The role of competitors like the Convair 880/990 and the VC-10 was vanishing while Boeing and Douglas were fighting for the pole position in the market. Although both manufacturers were working on new variants of their successful jets, it was obvious that both aircraft were reaching the final stage in development. Market analysis saw a huge increase in passenger numbers for the 1970s which could not be covered by the DC-8-63, the largest aircraft available at that time. A demand from the United States Air Force for a new transporter aircraft was the first sign of a new chapter in the world of civil aviation: The widebody era. Beside Boeing and Douglas, also Lockheed (which had no new civil project at that time) participated in the competition. Finally, in May 1964, the contract for the aircraft called CX-HLS (later C5 “Galaxy”) went to Lockheed. Boeing and Douglas, which put a high effort in money and manpower into this project, took the so won experience to propose new civil aircraft for the demand of the 1970s. After many years, the projects would emerge into the first two widebody aircraft on the commercial market: The Boeing 747 and the Mc Donnell – Douglas DC-10.