Originally Posted by
henry999
Your GRU-JNB flight, eastbound, trans-Atlantic, is presumably overnight. If there is more than 24 hours between the time you arrive on the 5th and the time you leave for DAR on the 6th, that is a stopover. Together with the stop from the 10th to the 16th, that makes two: not allowed. Three times through any airport, but only one stop. The same with your stop in BKK from the 10th to the 11th; if it's more than 24 hours between arrival and departure, it's not allowed (because of the stop from the 13th to the 22nd).
cheers,
Henry
Henry has the correct explanation. If you turn your GRU-JNB-DAR flight and your SIN-BKK-RGN flight into same-day connections (both of which are possible), your itinerary becomes legal.
You can also split the flights across a night if you observe the 24 hour rule, but this only works for SIN-BKK-RGN (i.e. arrive BKK at 2pm, leave BKK at 1 pm the next day). Between JNB and DAR, there are not enough flights to allow for this sort of flexibility though, there is only one flight per day on the route. BKK-RGN has three daily flights, SIN-BKK has up to 11(!) flights per day.