Deloitte made the declaration in a letter sent on Friday, which also confirmed that ‘winning’ bidder Bain has already pumped $125 million into the business.

The revelation came despite them losing a Federal Court case on Friday to gain access to secret details of Bain’s ‘winning’ proposal.

The offer will involve $800 million to recapitalise the airline and $125 million to keep the business alive during the administration process.

Bain Capital has reacted to news the airline's bondholders have launched an 11th-hour bid by making a series of new promises to staff.