No, the ATO is an unsecured creditor and stands at the back of the queue ranking equally with all other unsecured creditors, including customer refunds. Priority creditors first (including liquidators costs and employee entitlements), then secured creditors then unsecured creditors).
If they are as close to breaking even as Tim Jordan says, reasonable chance they may survive after a stint in voluntary administration (as
Virgin Australia did).
In voluntary administration, the administrators can either trade on (with a view to the company being recapitalised or the business sold under a Deed of Company Arrangement, being a binding agreement approved by a majority of creditors which usually releases debts in exchange for payment which may only be cents on a dollar, but usually likely to be a better outcome than liquidation) or otherwise cease operations. If there is no DOCA proposed at the second creditors' meeting, move on to liquidation.
Forward revenue is just an asset (and corresponding liability) for the administrators to deal with.
Due to be flying Bonza on Tuesday if they haven't gone under before then (with the return leg on the following Tuesday). Do you think it would be poor taste to wear my Ansett baseball cap on the flight?