Hi - I am doing a quick status point run to Melbourne and back tomorrow and planned to check in online and rock up last minute as I wont have any bags. BUT, I am getting an error when trying to check in so need to do it at the airport. What the latest I can check in? Air NZ are saying 90 minutes. Flight is Wellington to Melbourne leaving at 6am. (I assume I am somehow been flagged for a day trip across he Tasman).