I'll be carrying a heavy box and need to get a luggage cart to carry the box from the street to AA check-in at ORD T3. Last time I did this, I seem to recall that the dispensers are inside, not visible from the street (which makes no sense), and that a good bit of searching was required.

What I'd like to do, if possible, is tell the cab to pull up to Entrance x, such that I can go in and get a cart from near that entrance. But I wasn't able to find a map of T3 that is sufficiently detailed.

Would anyone be able to tell me where there's a cart dispenser at ORD T3 and what entrance it's closest to? In the general area of AA check-in desks, if possible, but not so important. Once I've got wheels, I'm OK.