The 3-3-3 seating on the 772 is welcome, as is the Y+ seating, and much preferred over AI's 3-3-3 on the 787 or the 3-4-3 on the 77W. Once UA move this route to a 3-4-3 on a 777, it will not be as pleasant a flight as it is right now.
AI are still 3-3-3 on all 777s for the moment.
UA is 3-4-3 though. I think most in eco on 16 hr flights would prefer more spacious 3-3-3. IMO airlines with 9-abreast 777 can definitely market this product over competitors smaller seats.
Everyone keeps saying that, and it really isn't true. These routes are usually served by PMCO GE powered 77Es. Those are 3-3-3 in Y. The only 3-4-3 arrangements in Y at UA are the 77Ws and the domestic configured, old 77As that are designed for hub to hub domestic runs and Hawaii. Even the 77Es that are getting reconfigured with Polaris are remaining 3-3-3 in Y. Almost all longhaul flights on UA are 3-3-3 in econ (787 and 777). The 744s were 3-4-3, but are gone, and there are fewer 77Ws than there were 744s, so I believe we are netting negative on the amount of 3-4-3s for longhaul at UA. This myth needs to stop being promulgated on A.net.
I welcome correction if I am wrong.
A318/19/20/21, A300, A332/3, A343/6, A388, L1011, DC-9, DC-10, MD-11, MD-80, B722, B732/3/4/5/7/8/9, B743/4/4M, B752/3, B762/3/4, B772/E/W, B788/9, F-100, CRJ-200/700/900, ERJ-135/145/175/190, DH-8, ATR-72, DO-328, BAE-146