Originally Posted by
miniliq
If you have any other milk run nominees, please chip in!
This style of operation didn't really develop elsewhere, because in fairly shorter distance you got into another country, and another administration.
If you want stops, the ultimate has to be, of course, the Imperial Airways flying boat service from Britain to Australia in the 1930s. The route is almost entirely over land (still is), and so aircraft range was not significant. There were 29 intermediate stops, and the trip took 11 days. This operated three times a week right through, and this one route alone absorbed 12 aircraft from the quite sizeable Empire Flying boat fleet - there were comparable routes to Africa, India, etc.