The connections offered at JFK are different to those at ORD, so AA can sustain both routes.
BOS would be daily, but seasonal just like it used to be at MAN. Like I said, it was the fact that the whole setup was wrong last time, and the fact it operated more than one season is testement to the fact that this could be a good route.
The fact is, AA have sat back and let BA dictate how the regions should work in the UK, but AA have seen pax numbers dwindle due to other carriers on route AA would happily operate, and now AA have turned around and said to BA, 'enough is enogh'
Now AA want a piece of the TATL pie that CO/DL have been feasting on