THE U.S. Air Force recently ordered twenty‐seven C‐97 Strato‐freighters in addition to the thirteen previously ordered, some of which have been delivered. These are the cargo version of the Boeing Aircraft Company's Stratocruiser.
Perry, H.W. (1948), "The Stratofreighter Air Duct and Anticing Systems: The Method of Manufacture and Installation of the Plastic Ducts Developed by the Boeing Aircraft Company", Aircraft Engineering and Aerospace Technology, Vol. 20 No. 11, pp. 335-336. https://doi.org/10.1108/eb031689
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