None of the terminals interconnect with airside walkways, so you do need to go through security again for a flight connection.
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Overall, passengers usually have to re-clear security for connecting flights, though there may be some exceptions depending on the airport and flight itinerary. To make this process easier, checking with the airline or airport ahead of time is recommended.
Airlines servicing Terminal 4 include SkyTeam carriers Aeromexico, Air Europa, China Airlines, Delta Air Lines, Kenya Airways, KLM, and Virgin Atlantic; Star Alliance carriers Air India, Avianca, Copa Airlines, and Singapore Airlines; and non-alliance carriers Caribbean Airlines, El Al, Emirates, Etihad Airways, ...
The airport grounds are made up of five terminals numbered 1, 4, 5, 7 and 8, skipping Terminal 3 and 6, which were demolished in 2011 and 2013 after Terminal 5 was expanded, and Terminal 2 which was closed on January 2023 to be used it for the airport's new international terminal.
When layover flights are booked with the same airline, your baggage will be automatically transferred through to your final destination. However, if the two flights are with different airlines, you may have to claim and re-check your baggage during your layover.
The recommended layover time for domestic flights is normally one hour. However, as previously stated, you may require longer if your flights are booked with two different airlines, if you are traveling to a very busy airport or if you require special assistance.
To make your connection, follow signs for AirTrain. You will need to reclear TSA security once you arrive in your departure terminal. For international arriving passengers, you must claim all checked bags at Customs and recheck with your departing airline, even if the bags are checked to your final destination!