The Airports Association is defending itself after airlines blame their charges,  for spikes in airfares. 

An international airport group says New Zealand’s domestic airfares have shot up more quickly than any other country by 63-percent in six years. 

But Air New Zealand says its fares are only up 35-percent.

Association chief executive, Billie Moore told Ryan Bridge the biggest driver is air capacity reduction, so smaller numbers of passengers are footing bigger bills. 

She says criticising airport charges has long been a strategy for major airlines but they're not the reason. 

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