Travellers face delays with strikes under way across Australia's eight international airports.
Department of Immigration and Border Protection employees are planning 10 days of disruptions to protest pay and working conditions.
The strikes started at 4am AEST (6am NZST) in Cairns and are scheduled for Sydney, Melbourne, Brisbane, Adelaide, Perth, Darwin and the Gold Coast.
The Community and Public Sector Union says border staff are furious over a pay proposal that effectively cuts current wages and leaves some workers $8000 (NZ$8944) a year worse off.