The "unusually hot and dry weather" has been blamed for Auckland Airport's deteriorating runway.
The airport has completed a review after two recent runway closures which stopped flights from landing for more than an hour in one case.
In January, pieces of broken concrete up to 30cm by 30cm and 12cm thick had been reported on the runway.
International pilots say maintenance of the runway has not kept up with the rate that it's deteriorating.
Auckland Airport's chief executive Adrian Littlewood talks to Lisa Owen.
