AA and the JFK/NYC Market
There is no point treating this as anything other than a disappointment.
Yes, AA's transfer traffic can route via PHL and ORD (which is fine, and should help those routes).
However, the undermining of a network carrier by TCX is a trend that, whilst welcome in the sense that they offer a cracking network ex MAN, is one that I hope has limits. For example, I hope it doesn't also force UA off the EWR-MAN route.
Speculation at this stage, but you never know what is around the corner.