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the Sikorsky 100-seat helicopter project.
http://www.flightglobal.com/PDFArchive/View/1989/1989%20-%200205.html?search=Mcdonnell%20MDX%20helicopter
http://www.flightglobal.com/PDFArchive/View/1989/1989%20-%200205.html?search=Mcdonnell%20MDX%20helicopter