https://centraljetcharter.com/boeing-727.html
n addition to domestic flights of medium range, the 727 was popular with international passenger airlines.[13] The range of flights it could cover (and the additional safety added by the third engine) meant that the 727 proved efficient for short- to medium-range international flights in areas around the world.


It was the first commercial airplane to break the 1,000-sales mark, but it started out as a risky proposition. The 727 was designed to service smaller airports with shorter runways than those used by Boeing 707s.


Adding to Boeing’s challenges were conflicting demands from customers: some wanted four engines, another wanted a twin, still others were satisfied with prop planes. Boeing was also still grappling with the startup and production costs of the 707.

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