Editing Boeing 707 (section)

===707-120B===
The 707-120B had Pratt & Whitney JT3D-1 turbofan engines, which were quieter, more powerful, and more fuel-efficient, rated at {{cvt|17000|lbf|kN|sigfig=3}}, with the later JT3D-3 version giving {{cvt|18000|lbf|kN}}. (This thrust did not require water injection, eliminating both the system and 5000–6000&nbsp;lb of water.) The -120B had the wing modifications introduced on the 720 and a longer tailplane; a total of 72 were built, 31 for American and 41 for TWA, plus six short-bodied -138Bs for Qantas. American had its 23 surviving -123s converted to -123Bs, but TWA did not convert its 15 -131s. The only other conversions were Pan Am's five surviving -121s and one surviving -139, the three aircraft delivered to the USAF as -153s and the seven short-bodied Qantas -138s (making 13 total 707s delivered to Qantas between 1959 and 1964).{{citation needed|date=January 2024}} The first flight of the -120B was on June 22, 1960, and American carried the first passengers in March 1961; the last delivery was to American in April 1969. Maximum weight was {{cvt|258,000|lb|kg}} for both the long- and short-bodied versions.