:In the early 1960s the Israeli Air Force wanted to upgrade to the C-130 Hercules which could lift larger payloads, but it was expensive and sales were embargoed by the United States.
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In addition to the Israeli Anaks a company called Aero Spacelines was converting old 377s to aircraft called Guppys in the 1960s.
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These were dubbed Anak (or Giant in Hebrew) and entered service in 1964.
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:Conversion of one 377-10-26, incorporating an enlarged upper deck and a fuselage lengthened by 16 feet to carry sections of the Saturn V rocket.
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A few were sold to smaller airlines, used as freighters; or converted by Aero Spacelines into enormously enlarged freighters called Guppies.
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;April 29, 1952: Pan Am Flight 202, a Stratocruiser 10-26 (N1039V, named Clipper Good Hope) en route from Buenos Aires-Ezeiza and Rio de Janeiro-Galeão to New York via Port of Spain crashed in the jungle in the south of the State of Pará.
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;August 1967: An Aero Spacelines Stratocruiser 10-29 (N90942) suffered a ground collision with Stratocruiser 10-32 N402Q at Mojave, California; the aircraft was damaged beyond repair.
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Pan Am Flight 202, a Boeing 377 Stratocruiser which crashed in the Amazon Basin in 28 April 1952
Pan Am Flight 7, a 1957 crash of a Pan Am Boeing 377 Stratocruiser 10-29