In the Uk, Virgin Atlantic are also seeking a government bail out with no sign as yet that it's likely to be forthcoming, most airlines will be on the ropes by the end of May anyway and with the current financial situation, no government will be able to bail out every company in every sector of the economy. Delaying aid forces shareholders to contribute their money first and undertake unpopular restructuring to cut costs, governments will step in at the last minute and aid those still standing so that essential services can be maintained.
British Airways will probably come through this though it will need help and possibly even be nationalised. The difference compared to Qantas is that air travel within the UK isn't vitally important. The country is small, densely populated and has an extensive road and rail network. The UK is a major hub with multiple foreign airlines flying in so there are many alternatives available for those wanting to travel internationally. KLM fly to more UK airports than British Airways do, and enable connections through Amsterdam.
Australia is as dependent on air travel as the USA which has given aid to it's major airlines, The Americans are no doubt concerned about a monopoly if two of the big three go under and can't be favouring one a single carrier.