"Our terminal staff are on hand to provide updates".
The airport is now experiencing technical issues at security and check-in desks, causing major interruptions to outbound flights.
An IT failure has caused chaos at Sydney Airport this morning with both the worldwide and domestic terminals affected.
Jetstar expects all their flights will be back on schedule by midday, after its morning flights were delayed by an hour on average.
"We are experiencing outbound delays while we fix this technical issue which we're working to rectify as quickly as we can", she said.
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The T3 Qantas Domestic terminal is apparently not affected. "We're advising passengers and visitors to avoid T1 and T2 until further notice", Sydney Airport said on Twitter.
The incident resulted in the entire departure lounge at the worldwide terminal at one point being cordoned off, with security searching through plant boxes, bins and under furniture.
Virgin Australia was working to minimise disruptions but says there will be "some impact" to flights throughout Friday as a result of the earlier issue.
A spokeswoman for Brisbane Airport told the Courier Mail security screens were closed for 30 minutes after the breach.
"We hope to have the area cleared shortly to recommence screening", Brisbane Airport tweeted.