How come newcastle and other small airports have flights to the usa, but stansted havent?
Heathrow is down the road. It's as simple as that.
Edit : Thought i would throw it out there for the non local radio listeners , BA's new advert on Metro Radio this morning made me smile , when they were touting business for you guessed it , New york ! They left out the via LHR bit until last min though , Not like we have a direct link there soon or anything BA lol
Most carriers operate on a hub/spoke system these days, feeding their hubs and having connecting pax change there.
UA does this from NCL, so does BA. So it is hardly a surprising that BA would not do NCL-EWR direct, and no one on this forum should expect it to.