I agree with SailorOrion. The 773 is a perfect step up from the 772 for traffic growth. I see UA, AA, DL, CO. Also Varig, BA, KLM, Egyptair, El Al, Saudia, Air-India, PIA, Air China, Asiana, ANZ.
Don't forget Air France & EVA have ordered the 773ER already.
I dumped at the gybe mark in strong winds when I looked up at a Porter Q400 on finals. Can't stop spotting.