Originally Posted by
JimInOhio
From what I can see from the CBP website, the Concourse C FIS facility isn't listing any arrivals they've processed before 2 PM. So the answer is pretty clear that earlier UA arrivals require a Moon Buggy ride to the main terminal (such as UA 73 arriving around 5 AM on the days it operates).
that’s interesting. On my morning arrivals I’ve always entered through Concourse C. Thank you for the update