What new routes can be added to take advantage of One World to the US side?
PHL-HKG
PHL-NRT or HND
PHX-NRT or HND
PHX-MAD
CLT-HKG
CLT-NRT or HND
PHL-DME
Others that are non-hub like(keeping in mind slot controls in LHR):
BOS-MAD
PIT-MAD (if DL can do PIT-CDG) why can't we make PIT-MAD work
Here's my two cents.
PHL-HKG? Not a chance. Not enough O&D and a very long flight, so very high cost.
PHL-NRT? This one is the most likely of any on your list. Pretty good O&D from PHL and strong hub at NRT. Perfect 787 route.
PHX-NRT? Nope. Not enough O&D and for too many days a year, the temperatures at mid-day (typical departure time to Tokyo) are far too hot.
CLT-HKG? Not a chance. Almost no O&D and extremely long flight, so even more costly than PHL-HKG would be.
CLT-NRT? Nope. Lack of O&D and very long flight. Yes, CLT is a huge hub in a fairly small city. And the only cities connected to CLT that aren't already connected to ORD or DFW or PHL are very small towns with two or three daily 50-seaters (or smaller Dash8s) and those towns won't fill up a flight to HKG or NRT.
PHL-Moscow? I doubt it. If Moscow made any sense, then why isn't US already flying to Moscow?
BOS-MAD? The AA/BA/IB joint venture already flies it (with IB metal). I do see more international flights from BOS, given that new AA will be the largest legacy network airline at BOS following the merger.
PIT-MAD? Nope. The new AA needs to fill in its major hubs to MAD before it takes on former hubs to MAD. Spain's economy is in the toilet and O&D between PIT and MAD is very small. CDG works because there's an awful lot more O&D to Paris than there is to Madrid. It's possible that PIT-LHR might make sense; remember that BA obtained some LHR slots when it took over BMI. O&D to London is much higher than to MAD.
HND slots will continue to be very limited and I don't see new AA getting very many more HND slots. If it does, then they'll be flown from AA gateways with very high Tokyo O&D, not from PHX or CLT.
If CLT or PHX could support service to Tokyo, dontcha think that NW would have been flying to those cities long ago? Or that UA or NH would have begun flying CLT or PHX to NRT long ago (where UA/NH has a hub)? Or that JAL would have begun flying to PHX or CLT?