Of all the trips I have made with Jetstar I have had my flight details changed EVERY time.
It makes a mockery of the email they send out:
"While we try to avoid any changes to our timetable, in this instance it was unavoidable."
On one instance, when booking my flight originally I had the choice of a 6am or 8am flight. The 8am was more expensive but also more convenient and so I chose that one. I was then rescheduled to the 6am flight, without any compensation or refund.
The 6am flight was then delayed until 8am. Oh, and my luggage was put on a 12pm flight.