Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

If you're not familiar with AA's gate layout at ORD, be sure to look for the terminal map near the back of AA's in-flight magazine; you should find a copy in your seatback pocket on your SFO-ORD flight.

And be sure to listen for the connecting-gate announcement that a flight attendant will usually make as your first flight approaches ORD: it's possible that a gate change could have been made after you received your ORD-LGA boarding pass at SFO.