Auckland Airport is being urged to be responsible with its charging of airlines. 

A Commerce Commission draft investigation has found the airport's planned expansion is justified, and some price increases are necessary to fund the investment. 

However, it found the organisation's targeted returns from airlines is around $200 million over what's reasonable. 

It found that travellers would most likely bear much of that cost. 

Board of Airline Representatives Executive Director Cath O’Brien told Ryan Bridge that this is the second period in a row where Auckland Airport has been found to be targeting excess profits. 

She said that they’re targeting a return of 8.73% on aeronautical caps, against the Commission midpoint of 6.98%. 

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• Regulatory changes needed as Auckland Airport's called out for 'excessive' charges
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• Auckland Airport charges too high - Commerce Commission