A Pacific Blue plane flying to Wellington has been diverted to Christchurch and declared an emergency landing overnight.
A Christchurch Airport spokeswoman said the plane landed safely about 12.30am.
"We enacted our ordinary emergency procedures because we were notified by the plane that it had a potential issue."
The plane was meant to land in the capital, but headed to Christchurch instead, a Wellington Airport spokeswoman said. She confirmed it was a Pacific Blue plane.
No further information was immediately available.