AirTrain to Jamaica/$5 ($2.50 if you buy a 10-ride metro card), E Train to Penn Station/$2.75, NJ Transit to EWR/$13 (+$5 if you buy from conductor onboard). You can also take the Long Island Railroad instead of the E train. Quicker but quite spendy. $10 peak/$7.25 off-peak plus $6 if you buy onboard.
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