In 1967 the RAF had a Britannia make a one way trip to Nebraska. It was hauling support equipment for a bombing competition – Vulcans verus B-52’s. On arrival a piece of test equipment was found to be broken in its carton and a load of mercury had disappeared into wherever. The RAF left the aircraft there.
Incidentally, the Vulcans won.
( My grammar checker is telling me that ‘was found to be broken’ is ‘Passive Voice’. What the hell is that? )