The only Round-Robin I knew was a Herc every Christmas Holiday which used to go around UK via about four or five Stations. You were not supposed to just 'turn up' for an Indulgence Flight but several used to and still managed to get on if there were spare seats. I managed to Indulge to UK from Singapore to get married - palputations getting back as the new wife received a telegram call-forward but I didn't....
It never went to 14MU 'cos you need a runway...