good for AA.. it is a hub to hub flight for them
AA/US has cut significant amounts of int'l TATL capacity and based on AA's traffic report, even more needs to come out.
and it is also possible that CLT-JFK like PHL-JFK which DL also operated was in part because DL needed to have a mechanism to ensure that US' policy of undercutting other carriers in their hubs left DL with alternatives to pick up traffic from US' hubs.
now that AA/US is now pricing more rationally, the chances are very high that AA will carry that traffic on itself while AA/US is also pulling less int'l traffic out of DL hubs.
DL still flies LGA-CLT. and UA still flies to EWR. plus DL flies from CLT to ATL, DTW, and MSP, each of which have int'l ops.
this is the rationalization of airline networks that happen as a part of consolidation. For CLT, it is a net reduction in total int'l seats including connectivity to other carrier int'l hubs.
and I would bet that DL will redeploy those JFK slots and aircraft for some other use.
it's more notable that AA is pulling down a number of ORD and DFW mainline routes even if for March. Easter 2015 is two weeks early than a year ago and within the first third of the time period in which it can fall. Cuts in March with an early Easter seem unusual.