Air New Zealand is warning travel agents that it's about to put domestic airfares up.

It comes at the same time as the national carrier has downgrades its full-year earnings guidance by 10 million dollars.

The fare structure for flights to Australia and the Pacific is also getting a revamp.

Aviation Commentator Peter Clark told Heather du Plessis-Allan the airline doesn't have a choice - as it's own costs have skyrocketed. 

He says people will simply have to suck it up. 

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