Pilatus Aircraft’s Pro Star Pilatus Center has contracted to sell the PC-12NG factory demonstrator on display here at the convention to Polymer Resources, Stamford, Conn. Polymer president Les Klein was on hand to accept the keys. . .Pratt & Whitney Canada has marked a major milestone delivering its 70,000th engine. The PT6A-60A turboprop is to be installed on a Hawker Beechcraft King Air 350. . .Sierra Industries, Uvalde, Texas, has cut prices by more than $100,000 for its Williams FJ44 re-engining mods for Cessna Citation Is, IIs and S-IIs.