When the Boeing 727 first entered service in the early 1960s, its distinctive trijet configuration immediately stood out. With one engine mounted in the tail and two more flanking the rear fuselage, the design diverged from the twin-engine and quad-engine jets emerging at the time. So why did Boeing choose this setup? Understanding the rationale behind the 727's three-engine layout reveals a complex mix of airline demands, regulatory challenges, and the technological constraints of the early jet age.
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