The price of oil has gone from $40 a barrel 6 years ago to $50 3years ago to over $130 now. It really doesn't matter what aircraft they fly, none will be economic if prices increase much more unless the market can tolerate large fare increases. (which it probably cannot) The latest gen 773 is about 10% more efficient per seat/mile than an A345 and about 15% better than 744ER on long range ops. Significant but given the price of oil has increased more than 100% over the last few years little more than cold comfort.
Take into account the cost of new aircraft as an intermediate step and it is hard to see it stack up to buy 773's now. QF will have to continue to remove or scale back un-profitable routes until the climate becomes more favorable.
With the A380 deliveries starting and with both current and further inevitable route/frequency reductions, they will have excess international aircraft capacity in the short-medium term.
A good start would be to shut down JQ international, return those aircraft to QF and retire some 763's. (I am not joking) LCC airlines are going to go to the wall big time over the next year if oil prices remain on the increase. People will have to get use to the fact that overseas travel is a luxury, not a right. Airfares are ridiculously and un-sustainably low on most LCC's (they are also contributing to environmental disaster)
By the way, why the hell are they meeting in New York?
There endeth the lecture :!: