Where do you land if there is an emergency during a trans-atlantic flight?

Depending on the type of emergency. If it is an engine failure, almost all aircraft that fly the non-stop trans-atlantic route are capable of flying with the loss of one engine. If the aircraft is able to maintain flight, but not be able to reach the destination due to loss of range, typically its either Keflavik or Reykjavik Iceland, or Shannon, Ireland as these are the few airports in the northern route that would be able to handle a diverted aircraft.

if the aircraft had total engine failure, or other type of emergency that that they could not reach any of these, it would make a water landing, but that possibility is remote, and has not occurred to the best of my knowledge. That is the main reason flights got canceled when the volcano errupted in Iceland, as the ash could cause aircraft engines to fail over the atlantic.

CAN YOU SWIM. ( On a Boeing Jet, if there's an emergency concerning a engine, that engine will be dropped and the other engine can handle the whole flight alone without any problem. I retired from Boeing and I know the Boeing aircraft is the safest best flying aircraft in the skies). Mike

You did not say which type of emergency -

With a twin engine, such as a 767, they are ETOPS and have landing airports -

A friend of mine was flying with US Air as 767 captain -

He once had to land in Iceland, nasty winter weather and fog... on one engine -

He told me the diversion was the longest 90 minutes in his life -

I used to fly airplanes with 4 engines - 707, 747... even 3 engines is ok -

An engine fails, you still have all options... continue, go back - no worries -

Atlantic emergency airfields are...

Gander (Canada) - Keflavik (Iceland) - Lajes (Azores) - Shannon (Ireland) -

Or... you better know how to swim - and your nickname not be "Sharkbait" -

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When crossing remote areas, aircraft usually have diversion airports planned. ETPs (equal time points) are plotted along the route to tell you which airport you are going to if something goes wrong.

Crossing the Atlantic for example, you will reach an ETP between say Goose Bay and Keflavik. If anything goes wrong before that particular ETP, you go to Goose Bay, anything after and you go to Keflavik. There will be another ETP between Keflavik and maybe Shannon or Prestwick and so on...

If it's so bad that you can't make it to an airport, then you crash.

You never fly to a place from which you cannot land safely within certain time limits. Long flights are full of alternatives along the way.

The plane lands on the water at a slow speed. And then you will have to wait for a boat.

Look out for the whitetips.

You're gonna go for a lil' swim.