NW6 is the first international arrival of the day. If it gets in early enough, USCIS may not even be ready for it.
And if you, like me, get through immigration and customs quickly (no checked bags, frequently), TSA won't be ready either.
(Fortunately, last time I did this was November 5, and the TSA people were all smiles about the election...)
WC is small but nice. Business workstations are conveniently hidden and most people don't realize they're there. I sometimes wander across the concourse since I live 90 miles from the nearest Wendy's.