Didn't AA move the JFK-NRT flight to JFK-HND not long ago? It looks to me like HND will become the business airport for Tokyo since it's quite a bit closer to downtown than NRT. Sorta like LGA is the businessman's NYC preferred airport for domestic, especially within the perimeter.
They had operated JFK-HND and JFK-NRT concurrently throughout last spring and summer, HND was suspended in September and is scheduled to resume June 1st, the same day NRT ends. I've taken the JFK-HND flight myself and its really great, the problem is the return is too darn early. The timing is similar to AA's awful ORD-PEK slots.