Originally Posted by waffle

AA Gold/oneworld Ruby isn't entirely useless, it'll let you (and everyone on your booking) use the Business Class/Priority check-in counters.

Yes, things are fairly obvious once you get off the bus. The bus drops you off the A terminal. Look at the departure screens to find out what terminal your flight is leaving from.

If it's Terminal C, walk over there to check any bags, then come back for the lounge if you want. Leave early enough to clear security and passport control, which are indeed centralised.

If it's Terminal A (unlikely), check-in, security and passport control will be at the gate, and I think the only gate capable of handling widebodies is the one near the entrance.