Thanks all again.
As posted in teh other thread too, have changed plans.
Am flying slightly later, land JFK 12:35, then on a First Class seat out of JFK at 17:20.
Gives nearly 5 hours at JFK which should cover off immigration, security, food for kids and a shopping trip for wife.
At least T8 looks like it has a few shops and eating places. I know the area round the BA gate at T7 is pretty poor for all that.
As I have said elsewhere it is strange that AA do not allow Domestic First Class passengers access to the lounges unless it is a transcontinental flight.