Personally I don't recommend Jetstar, they are definitely a budget airline, but for the price you are still paying they should be able to get their act together and try to coordinate flights to minimize delays for passengers.
The old saying Cheap and Cheerful definitely doesn't apply to Jetstar and honestly they are not that much cheaper, I think I will definitely be flying with a different airline in the future.
Fly Jetstar if you have a few hours to add to your travel and you don't mind sitting around the airport for 5 or 6 hours.
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