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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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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;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.
It features an enlarged fuselage, like the Mini Guppy which was produced by Jack Conroy's previous company, Aero Spacelines.
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Built by Douglas Aircraft Company, it was small enough to be transported by a specially built plane, the "Pregnant Guppy" built by Aero Spacelines, Inc.