> A train could do this in 20 minutes or so.

There’s already a train that does this. It’s the express A train, which gets you to the AirTran. And as someone who has taken the train from Manhattan to JFK on multiple occasions, it most certainly does not take 20 mins or so. It takes at least an hour and that’s not including the highly likely delays.

I think it would be inefficient to have a dedicated train take up the line just for JFK.

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piva00 an hour ago | parent | next [-]

Stockholm with a bit over 1 million people has an express train from Arlanda airport to the center of the city, it goes at ~200km/h making the transit of ~40km in 20-25 minutes.

I don't understand why it would be inefficient for one of the busiest airports in the world to one of the largest cities in the world to have a similar setup.

	▲	jonnybgood 29 minutes ago \| parent [-]
		Do you know where JFK is? JFK does not sit outside the city like Arlanda. JFK is in the NYC Queens borough surrounded by highly dense urban sprawl. That setup makes sense for an airport that sits far outside the city. No track to JFK can support anything near a 200km/hr train and building a track for such a train is a nonstarter.

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d--b 26 minutes ago | parent | prev [-]

I always counted 50 minutes from midtown to JFK, taking the E train to Jamaica station and the air train.

But I think GP's point is that it could be done in 20 minutes. The A train is a subway, it's nowhere near the speed of the Heathrow Express.