http://www.stuff.co.nz/business/money/8281433/Watchdog-probes-Air-NZ-credit-card-fees Air New Zealand is again under investigation over the credit card fees it charges passengers. It is the second time in a year the airline has come under scrutiny for fees that could breach the Fair Trading Act. The airline charges a $4 processing fee on all domestic bookings made by credit or debit card. That rises to $6 for trans-Tasman and short-haul Pacific flights, $12 for a trip to Bali, and $17.50 for all other international fares. It charges the fees per person per flight, meaning a family of four flying return within New Zealand will be charged $32 for one credit card transaction. However, the airline pays only about 1 per cent of the total flights package to the processing bank.