The High Court in Wellington has begun hearing a judicial review on the landing charges at Wellington international airport.
Air New Zealand was sought after the airport company announced a plan to raise the charges by almost 3% a year for the next five years.
Air New Zealand describes the increase as unreasonable and claims the company failed to consult in good faith before setting the fees.
It also claims that the airport is trying to earn monopoly returns on the charges.
However, a lawyer for Wellington International Airport Ltd has asked the court strike out the charges.
He said legislative changes coming into force next week will put such disputes in the hands of the Commerce Commission for resolution.
The company is also seeking a judgement ordering Air New Zealand to pay the fees.