Only partially related, but in the AAIB report on the US-operated Canadair Challenger business jet accident at Birmingham airport a while ago it was apparent that the aircraft had hopped round Florida picking execs up, then did the long transatlantic trip to Birmingham, arriving in the evening, and after what could have only been a short night and no more than a couple of hours at the company's office in Coventry, even if they started at 08.00, the same pax were heading back to the US at noon the next day.
Seemed a huge cost for very little business time.
I've done a few mad trips myself but nothing like this. Once sent a secretary on a round trip Gatwick to Heraklion, returning on the same charter aircraft, to get a legal document signed by a director who was on holiday there, and who came to the airport to do it. Actually at about £100 it was quite cheap.