Ricardian, fascinating. In my time at ASI we caused a C130 aeromed to go to Rio rather than UK, 5 hours rather than 20.
The plan was to drop off the patiently. The crew plan was to night stop. Next day the Brazilians would not allow them toitoi depart without the patient. HMG would not permit the patient to embark until the Polish Government paid the bill for the airfare which they refused to do.
I think they eventually paid and the patient was flown back to his ship.