Hi all, I am planning a trip from Atlanta to Australia in October 2013. I wanted to buy upgradable economy tickets on Delta/Virgin, but I can't find upgradable tickets in any fare class. Is this customary with Delta/Virgin? I just can't afford the $10K+ business class, so I have to try plan B. Any tips for getting upgrades to Australia? All things considered, which airline is better (seat comfort, service, food, etc)?