Subsidiary company Zeal320 was introduced to help combat increasing labour costs. Zeal320 operated Air New Zealand's trans-Tasman fleet of Airbus A320-200 aircraft under the Air New Zealand brand. On 31 July 2006, flights were re-numbered to the NZ700-999 series for trans-Tasman services, and NZ1000 series for domestic services. All of Air New Zealand's A320-200s were registered to Zeal320 until 26 November 2008, when ownership of the fleet was transferred back to Air New Zealand. However, staff that worked the A320-200 fleet were still employed by this subsidiary. This was a source of contention within the airline group in which these employees were paid at a lower scale than their mainline counterparts. Continued industrial action by staff employed in this subsidiary during 2009 permanently delayed a proposed low-cost carrier airline as a successor to Freedom Air that would have also employed the Airbus A320 on domestic routes to counter Jetstar Airways, also operating in New Zealand. In 2015 Zeal320 was removed from the New Zealand Companies Office.