Originally Posted by jrl767

the capability has been around for a long time

one of the first Boeing Flight Test missions that I worked as an analysis engineer (~Feb 1979) was on the Lufthansa 747-200 with the ferry kit for the GE CF6-50


c'mon ... in AOG (Airplane On Ground) situations the airline's first priority is to get the jet back into revenue-capable (airworthy) status as quickly as possible