K25 slide scan. Delivered 1974 to Delta as L-1011-1 N711DA, later converted to-50. American Trans Air 1985, leased to Aer Lingus for summer 1990 and 1991 seasons. Withdrawn Victorville 2002. For many years ATA's TriStars formed a significant part of civil contract airliners operating for the USAF Military Airlift Command MAC, renamed Air Mobility Command AMC in 1992.