Guy, do please be very very very careful when booking JS online. I recently read the T&Cs. There is plenty of room for JS to entrap the customers. It states very clearly if you book online and don't hear back from them via email or etc it is canceled and you have to call them back. They will trick you in sending an "Invoice" and you may think this is done .... but NO!
With the T&Cs, what can happen is JS can tweak or change the online booking steps or web timeout and not let the payment transaction go through. They can do this if they want to increase the fare the next hour, next day or etc. They send you an invoice, you will think it is a itenary BUT it is NOT! They can entrap you when you come back online to re-book it and you will have to PAY MORE!!!. The online booking system is not stable and this is what happened to me.
PLEASE PLEASE PLEASE DO NOT FLY JETSTAR.