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American Airlines Boeing 720-023, circa 1961. Originally delivered to American with Pratt & Whitney JT3C Turbojet engines, this and nine others were eventually converted to a 720-023B with the fitting of JT3D Turbofans. JT3D engines had lower fuel consumption and higher thrust than the JT3C. (Image: Boeing / American Airlines)

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Photo: N7076 (CN: 18064) Boeing 720-027 by Paul Thompson Photoid:5999389 - JetPhotos.Net

Braniff International Boeing 720-027 N7076 is taxiing to its gate at Dallas-Love Field, February 1972. (Photo: Bob Polaneczky, Copyright: Braniff Flying Colors Collection)

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