Join Date: Mar 2009
Location: NYC
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Posts: 19,972
The entire airport is connected post-security so you could do that, but it's a long walk. Wear sneakers. You honestly might just be better off clearing security in A.
I can't tell you about PreCheck but I do believe there's an EMS line. I would give yourself 90 minutes at the airport to play it safe on such a busy day.
-J.