This old PPRuNe thread (link below) about this subject has been resurrected and added to during the past couple of days.
http://www.pprune.org/forums/showthr...hreadid=120362
The Bristol Airport website is still maintaining its old pop-up which seeks to have the local business community come out in support of the initiative to get a BRS-EWR daily flight.
There is no further news about its coming to fruition, either on the airport website or in the local news media as far as I can tell.
The 'experts' in the aforementioned thread suggest that a transatlantic 767 (the likely AA equipment) would be too big for the BRS runway, with a CO 757 more likely.
I don't profess to be an expert. I am just a regular passenger user of the airport and someone who is always keen to see additional services in the south west of Britain as a whole.