The economics of the route continued to be helped by relatively low fuel prices. The airline uses an Airbus A330-300 aircraft on the route with a seating capacity of 377.
Ismail said the service had also boosted tourist numbers to New Zealand.
Statistics New Zealand figures show the number of international arrivals from Malaysia spiked in April, the first full month of AirAsia X services.
In April the number of arrivals increased by 44 per cent on the same month last year to 3872 . Of those there were 2688 holiday arrivals, and that was 60 per cent.