I agree about all this nonsense about PHX going away. Here are the latest stats from the COP. It is a very interesting read on all of the passengers that fly thru PHX. O%D, international, cargo etc. AA has more pax that WN so I would say that AA has a bigger operation than WN. This info has past years and is right up to August 2018. http://www.skyharbor.com/About/Informat ... Statistics
WN actually has nonstop service from PHX to destinations that AA doesn't serve nonstop from PHX such as BUF, MDW, CLE, DAL, FLL, HOU, SDF, BNA, MSY, RDU, TUL, and ICT. On the other hand, there are some domestic destinations served by both WN and AA that have nonstop service out of PHX on AA but not on WN such as AMA, BOS, CLT, LGB, LBB, MAF, MEM, and DCA.
While WN discontinued PHX-BOS nonstop service 6 years ago, WN could bring back PHX-BOS nonstop service since WN is now much bigger in BOS than it was back when WN dropped PHX-BOS nonstop service and since there are many WN customers in PHX who prefer to fly on WN over AA or B6. WN could also add PHX-MEM nonstop service in order to better compete against AA in the PHX market. WN will also likely add PHX-LGB nonstop service if it can get enough extra slots at LGB.
AA could add nonstop service to at least CVG, SDF, BNA, MSY, RDU, and TUL from PHX in order to better compete against WN in the PHX market. CVG, SDF, BNA, MSY, and TUL are also within the range of American Eagle regional jets from PHX and AA does have the option of adding American Eagle nonstop service to CVG, SDF, BNA, MSY, and TUL from PHX.