When 2 airlines are involved on the same ticket and the issuing airlines cancels the route but the other airline is still operating their route what are the DOT rules regarding this? I am thinking the issuing carrier is responsible for refunding all costs. I have NZ and BA segments on the same ticket, NZ has cancelled their segment but is implying that there aren't sure if BA is going to refund the other sector since BA has not cancelled those flights which to me sounds like BS. I paid a single fare to the TA and the NZ record locator pulls up all sectors.