Proof of onward travel means that airlines and governments want to make sure you are not illegally immigrating to their country, so they need to see proof of a return ticket home.
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You will pass through a US immigration checkpoint shortly after you exit the plane. Make sure you have all your required papers in order and ready to show to the CBP agent in the airport when the time comes. Remember to pack the documents you need to enter the US in your carry-on luggage for easy access.
Proof of onward travel means that airlines and governments want to make sure you are not illegally immigrating to their country, so they need to see proof of a return ticket home. Basically, some countries want to make sure you aren't attempting to move there on a tourist visa and never leave.
You'll get through customs in a couple of minutes (unless you are stopped for extra checks). It's immigration that can take time. If you have booked this as a single ticket and you meet the minimum connection time then the airline is responsible for getting you on the next available flight at no extra cost.
FAQ 9) Are return tickets required with a valid visa? No. If you have a valid visa you are not required to be in possession of a round-trip or onward ticket.
Does a flight ticket expire? Yes, airline tickets expire one year from the original date of purchase for most airlines. However, if you exchange the original ticket for a new ticket then some airlines will start the one year clock over again.