If there is some substance to the rumour that Keg posted, then my long term conclusion is that Boeing has offered a very good deal to provide an interim capacity until Boeing makes the B787-10 available. This would stop Qantas buying the A350XWB while solving Qantas' short term capacity problems. As Boeing is designing the B787 flight deck to be a seamless transition for B777 rated pilots, it is possible for CASA to approve a dual B777/B787 endorsement for the duration of both types remaining in QF service. It certainly would be welcomed by mainline pilots.
