Yes, in 2026, the JFK AirTrain is free for all travel between passenger terminals, as well as to the hotel shuttle and rental car facilities at Federal Circle. A supportive peer "commuter" warning: you only have to pay if you are entering or exiting the system at Jamaica Station or Howard Beach Station (the connections to the NYC Subway and LIRR). As of early 2026, the fare for those stations is $8.50. Since the MTA phased out the physical MetroCard at the end of 2025, you now pay using OMNY (contactless credit/debit cards or phone wallets) at the turnstiles. If you are just moving from Terminal 4 to Terminal 8 for a flight connection, you simply hop on the train and ride without ever passing through a payment gate.