Well this thread's taking a weird turn, so let me tell you about the cool way the flights to NY work from City airport.
The runway is, due to its geographical location, very short, and they need to gain altitude very quickly due to the tall buildings surrounding it. There aren't many planes that are able to do this which are also Trans-Atlantic, and even those which are can only do it with low levels of fuel (because, full of fuel, it can't gain altitude quick enough). So what they do it take off with hardly any fuel, land in Dublin and refuel. BUT because Ireland has some batty agreement with the US (a bit like Canada does, and the UK does with France around the Chunnel), they can actually do all the visa and immigration stuff there in Dublin whilst the plane's being refueled. Because of this, the plane can then land in a domestic terminal at JFK and the passengers depart the plane largely unmolested. This way, whilst they do have to stop, the actual time between getting on the aeroplane and getting out of the terminal in NY is about the same. Magic, huh? Also, because City airport is so tiny, you actually spend less time in the airport and it's centrally located. Basically, it's cool as shit.
I didn't even know City did trans-alantic flights to be honest.