Tigerair Australia pilots have commenced protected industrial action, which the Australian Federation of Air Pilots (AFAP) union says could result in flight cancellations and disruptions.

Virgin Australia has moved one step closer to potentially deploying its low-cost carrier unit Tigerair Australia on international flights.

Tigerair Australia will shortly add a fourth Boeing 737-800 as part of its fleet transition that is expected to take a few more years to complete, chief executive Merren McArthur says.

Virgin Australia has raised the proposed codeshare agreement between Air New Zealand and Qantas with Australia's competition watchdog, chief executive John Borghetti says.