C9 and E2 (F2 would entail going all the way around Terminal 2 or going under it). There are stairs and signs marking it. It's not on the overhead signs though.
I guess that's why I've never noticed it with no overhead signage. I am on a flight in Aug. from CVG to SFO via ORD and the CVG flight usually arrives near E2, and the SFO flight generally departs from Concourse C. This shuttle should save some walking. Any idea how long the wait is between shuttles? As for signage, if it's not marked overhead, what should I be looking for? Thanks.