It's not the worst-written article on the subject I've ever seen, but he makes one glaring error:
Finally, American maintains an unquestioned hegemony in Charlotte, owning a stunning 88-percent of the market share. American is probably not too eager to cede much of that control, which serves as a competitive advantage for the airline.
Actually, in 2014, US+AA boarded just over 90% of the passengers at CLT, but that does not equate to a "market share" or 88% or 90%.
In 2014, US+AA had a 64% market share of the local market - the O&D passengers. Still impressive, but not a 90% or 88% market share.
Thing is, he mentions O&D but does not address CLT's somewhat small O&D numbers. Compounding his error, he uses his "88% market share" fallacy as another factor that argues in favor of keeping the CLT hub at or near its present size. The number that will influence decisions about CLT is the 65% share of the local market and the fact that on average, only 15% of the passengers that US boards at CLT are O&D, and 85% of the passengers that US boards at CLT are connecting. That's a very high connecting percentage.
Meanwhile, the other airlines, including DL, UA, WN, B6, LH and the rest are carrying almost exclusively O&D, as that group has attracted 36% of the CLT O&D. Delta alone has 19% of the market share (O&D) at CLT.
PHX is a huge O&D market and AA should be able to maintain a large presence there, despite the huge presence by WN. Plus, every other airline also flies to PHX, so DL and UA soak up some of the O&D. PHL? Fairly large O&D market except for NYC and WAS (due to Amtrak) and decent connectivity up and down the east coast. Not enough O&D to sustain TLV, and perhaps some other European destinations end once the three-year promises expire.