What airport does the registered mail coming from Italy to Houston,Texas arrives to?

it arrives to one of NYC's airports and from there it is redirected to various states of the US? I'm just asking to understand what will be the path of the mail. Thanks, folks.
Update: Thank you very much Rona Lachat, for your answer! It's been very useful. The international mail office of Italy is probably located near to Malpensa Milan Airport (it is only that one for the whole country according to what I've read).
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