Boeing has released several variations ... One version of the plane that never made it off the drawing boards was the 747 Trijet. In the 1960s and 1970s, the company toyed with building a three ...

50,000 people 4.5 million parts from every state and 17 countries 75,000 engineering drawings Boeing began to work on improved versions of the 747. In 1971, the manufacturer introduced the -200 ...