Court Line Tristars
Both aircraft indeed went to Cathay in 1977 having been reported stored at Palmdale after leaving LTN late 1975. "AA" then went to Aer Turas as EI-CNN in January 1997, appearing at the airport as such - I think minus any titles - on 24/6/98. My anorak log has it back and carrying Air Scandic colours on 12/5/99 and 16/5/99. Its active life ended when it was ferried to Abu Dhabi on 31/10/99. getting broken up there around Nov 2006.
"AB" went from Cathay to Caribbean Wind Airways as V2-LEM in March 1996, arriving at LTN as such at 0009 on 17/3/96, again as I recall with no titles. It was still there on 28/3/96. Air Transat then acquired it as C-FTSI in May 1998, but they only had it for a year or so, with the aircraft getting broken up in December 2000.