Jetstar passengers are experiencing lengthy delays after an IT outage disrupted check-in processes across the country.

Brisbane and Sydney airports have been thrown into chaos as delays continue with some flights cancelled.

Some flights are experiencing short delays this morning due to an IT outage affecting a few systems.
Our technicians are working on the issue.
We appreciate delays are frustrating and apologise to customers for the impact to their journey.

— Jetstar Airways (@JetstarAirways) December 9, 2019

AIRPORT | Passengers at Sydney airport are experiencing length delays after a Jetstar IT outage. pic.twitter.com/94yzNM2Jre

— 2GB 873 (@2GB873) December 10, 2019

Brisbane Airport has confirmed the IT systems are coming back online and urges customers to check travel updates.

⚠️UPDATE: Jetstar systems are coming back online. Check travel alerts for updates: https://t.co/aEvRUwgVW9

⚠️Passenger check-ins are being delayed for international flights due to an outage of the global Advanced Passenger Processing (APP) system.

We appreciate your patience.

— Brisbane Airport ✈️ (@BrisbaneAirport) December 10, 2019

Later this week more than 250 Jetstar employees will strike during busy periods.

Image: Twitter/Nabeel Hassan Syed