Happening today. I get up 3:30am to catch a 6:40am flight to Gold Coast. At the gate after check in they firstly advised it will be delayed to 7:30am, then at 7:50am we got a text advising it will be delayed to 8:35PM for operational reason. For my entire trip history I took Jetstar twice and last time my flight was cancelled 3 hours before departure as they think the passages are too less.
Have to swear again that I would never fly with Jetstar in the future.