Travellers are facing lengthy delays at airports across the country with Jetstar, Tiger Airways and Virgin Australia check-in systems failing.
There are chaotic scenes at several departure terminals with Perth, Brisbane, Sydney, Adelaide and Melbourne all reportedly affected by the technical glitch.
According to The Australian, Jetstar informed passengers at Sydney Airport the delays would exceed two hours.
It has been reported that passengers are being checked-in manually and that no specific seating on flights is available.
In Brisbane, Channel 7 reporter Michael Coombes says computers have been fixed and electronic check-in is restarting.
"Delays in Brisbane are around two hours at the moment and will continue into the afternoon as staff clear the backlog of delayed flights".