Air New Zealand A320 ZK-OJR positioned Christchurch – Palmerston North early this morning as NZ6202 in order to operate an additional Palmerston North – Christchurch service as NZ1915. The aircraft then remained on the ground at Christchurch throughout the day before operating an additional Christchurch – Palmerston North service late in the afternoon as NZ1916 and positioning back to Christchurch as NZ6203.