aftermarket re-engining
A bit of well-buried history:
1983-84, Delta & All Nippon were gung-ho to re-engine their TriStars. They needed one more operator to make the program viable - TWA - but TWA was in no position to embark on same.
In fact, Harry Stonecipher's MD-80 lease program was the only thing that kept TWA's head above water for a while.