Originally Posted by
tinkybelle
as our famous female said
please explain

from the Jetsrat Conditions of Carriage to which passengers indicate agreement when making an on-line fare purchase (underlining is mine):
Originally Posted by jetstar.com
5.4 Non-refundable fares
Some fares types are non-refundable . Please refer to the applicable fare rules for more information.
Even if your fare is non-refundable, if you do not travel you may be able to claim a refund of certain charges or taxes excluding fuel and insurance surcharges. If there is a charge or tax which Jetstar collects on a per passenger basis to remit to an airport or taxing authority, and we do not have to remit that amount as a result of you not travelling, we will refund that amount to you, after deducting a reasonable administration fee (see jetstar.com/faretypes.html for current fees). If the administration fee reasonably incurred exceeds the amount of the refund, no refund will be paid.
So, how much are the taxes and surcharges that were collected by Jetstar on behalf of airports or taxing authorities that Jetstar has not needed to remit to those authorities? How much is left over owing to you after deducting the administration fee?
Of course, if the admin fee exceeds the taxes, then I assume Jetstar is going to be generous enough not to charge you the remainder of the admin fee.