Originally Posted by
The _Banking_Scot
...on AA you get extra baggage allowance IIRC)
You get two free bags as a BA Silver or Gold on AA (and anyone in your booking). You also get priority checkin, boarding and Admirals Club access.
If you're a Gold, you get free WiFi in Admirals Club lounges that still use the scratch cards, exit row bookings, access to the Flagship lounges (which really are not on par with any BA lounge at LHR) and a free drink and snack if you're in economy along with free "headsets". Often you'll have to flash your card but once you do, in my experience you get very well treated and pretty much unlimited booze!
HTH,
Rod