After clearing immigration and collecting your baggage, you will need to proceed through the customs area before being allowed to exit the airport.
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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.
The coalition government committed in 2010 to reintroducing exit checks. From 8 April 2015, we will collect information on passengers leaving the UK as we do for those entering. Exit checks will provide us with vital information that confirms a person's exit from the UK.