New York JFK connection for two separately purchased international flights [duplicate]

X (a European city) --> New York, JFK
New York, JFK --> Y (a South American city)

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Can you link two separate flights?

A: It depends, but the general rule is NO. Some airlines will through check baggage onto separately ticketed flights, but some won't (even if both tickets are with the same airline). Some airlines will take pity if your delay is due to them, but others don't.

Do you go through customs twice on connecting flights?

You only go through once. If you connect through another country, you will just have to go through security and not customs. Incorrect, it all depends on the country and the airlines you're traveling with. Remember customs and immigration are different things and in some cases you'll clear then in different airports.

Do you have to go through TSA again for connecting flights International?

Yes, a security check is mandatory when you take a connecting flight. This is because there is a time lag between getting off one aeroplane and getting on-board another to reach your destination.

Do you have to go through customs for a connecting flight JFK?

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!

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