It's all there in the T&C's. Don't think many people read them.
5.2 What your fare does not cover
Your fare does not include ground transport between one airport and another or between the airport and any other place. Meals and refreshments are not included in your fare unless the applicable fare rules provide otherwise.
Jetstar does not guarantee it will be able to carry you and your Baggage in accordance with the scheduled date and time of the flights specified. Schedules may change without notice for a range of reasons including but not limited to bad weather, air traffic control delays, strikes, technical disruptions and late inbound aircraft. Flight times do not form part of your contract of carriage with us (see clauses 9.1, 9.2 and 9.3)