I recall Dan-Air detached a B727 to Australia 1989/1990 to operate the ADL/PER/ADL ETOPS route, Aussies could operate the route with 2 engines using a highway as an alternate, alas the European authorities viewed things differently, trouble was that the B727 that Dan Air detached could carry passengers and fuel but not both at the same time so one B727 came home whilst a replacement B727 went down.