The Commerce Commission has confirmed it will not be formally putting the cost of flying under the microscope.

Rangitata MP James Meager has suggested the Government could help keep fares competitive by supporting regional airlines.

It's been revealed some flights to Pacific Island nations are cheaper than certain trips within New Zealand.

Commission Chair Dr John Small says flying short routes with low demand is very expensive.

"There's no law against charging high prices - that's the reality of things in New Zealand. If it's a monopoly - on a monopoly route - it's potentially able to be regulated."

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