The competition watchdog revealed the cut in seats for sale during the last few months came despite the local industry hitting 97 per cent of pre-COVID passenger numbers in June.
The Kiwi flag carrier is in a flap after Emirates launched a near identical version of its iconic 2016 TV advert featuring Dave the goose, who skips a migration to fly on one of its aircraft.
On Tuesday, it emerged the problems also led the budget airline to cancel flights to Phuket and Japan due to the fleet issues.
It comes after the ABC’s flagship investigative program on Monday made a series of allegations, including that remaining employees are working longer hours and working at “max capacity”.
The airline said “engineering requirements” were behind the problems, which some have estimated have affected thousands of Australians holidaying in the popular resort.
The TWU revealed on Sunday morning that 96 per cent of Dnata workers agreed to the move, which will see 350 employees across Brisbane, Sydney and Adelaide airports stop working.