Short Haul 767s have never operated the MAN-JFK flight, there is no chance at all of that happening.
As for the route passing to AA, there is no chance of that happening any time soon.
Been persistent rumours about the route being canned. But unfortunately for BA, it steadfastly refuses to make a loss. So each year, BA do a trick to see if they can make the route unprofitble and so withdraw the oddball route in the network. Can it really be 8 years ago that BA/AA were going to offer at least 6 services a day to the States when they first thought about a joint-venture.