Even DJ should know that bilateral treaties dictate traffic rights for international & regional services.
Interestingly enough they wrote to regional Pacific countries asking if they wanted DJ to fly into their own back yard - and at whose expense. Their own national carrier would be the first to feel the effects of DJ’s arrival.
They should be checking with the DoT&RS/IASC in Canberra to see where open skies agreements are in place (USA & SIN) &/or what shelf capacity is available for their use.