Delivered new to Swissair 17th March 1982 and leased to Balair Apr 1982. Operated for Swissair in summer 1990 and merged into BalairCTA Jan 1993. Transferred to Swissair March 1995 and traded back in to McDonnell Douglas as N531MD 18th Aug 1996. Converted to a MD-82 and then delivered to TWA as N921TW 25th June 1997