tl;dr For example, one flight from Doha, Qatar, to Melbourne had an additional stop in the Australian city of Adelaide, which was registered as the final desti

tl;dr For example, one flight from Doha, Qatar, to Melbourne had an additional stop in the Australian city of Adelaide, which was registered as the final destination. Passengers would disembark the aircraft in Melbourne, but a few would remain in the terminal to make the final leg to Adelaide. (...) In this case, Qatar Airways was making these extra journeys to avoid caps that allow it to make only 28 weekly trips to Australia’s major airports, which includes Melbourne. Landing at Adelaide Airport, which is not among that list, as the final destination enabled the airline to make additional journeys to Melbourne, as there were no limits on flights to non-major airports.