With Gordon at the helm UA will phase over to an all Boeing fleet - like CO did. The Airbus aircraft will eventually be phased out - and I could see the new UA/CO getting the 748 to replace the 744, as well as more 787, etc. If Boeing is offering it, Gordon will buy it with some special deal.

With DL gone, UA/CO will pick up some of the DL compatible aircraft - like the 764. AA will pick up NW Asia and DTW - and maybe some pieces of DL.

Two airlines left - new UA and AA.