The Commerce Commission intends to reopen an investigation into the way Air New Zealand charges customers paying with their credit card.
The commission opened an investigation into the airline for the same reason last year, but no action was taken.
Air New Zealand charges $4 per domestic flight, $6 for flights to or from Australia and $17.50 for international flights in any transaction using a credit or debit card.
A commission spokesperson said the investigation is being reopened after several new complaints were received about the fees.
She said the commission will look at how the surcharge is calculated and the way it is described to customers.
The airline said in a statement, it incurs $20.5 million in credit card charges each year, but recovers only $19.1 million from customers.