Mvic,
AA gives 1 mile per mile flown on all economy fares. If you fly 100,000 miles on 1 World (excluding BA transatlantic) or AA marketed code shares you will qualify for ExecPlat. There are faster ways to qualify, but only by flying First or Business.
Last year we received 4 VIP2s which were good for a 1 itinerary 6 segment max upgrade from any fare to the next class of service. These upgrades are not subject to any capacity controls (a plus over UA System wides), but may not be used on codeshares (a minus since AA only flies to Tokyo in Asia relying on codeshares with OZ, JL, and Eva Air for many other destinations).
The other advantages over UA are: use miles to upgrade any fare, get elite bonuses (100 percent) and electronic upgrades on all 1 world flights worldwide, and effective triple miles if you give up your domestic upgrades and fly primarily internatinal.
In answer to your direct questions, AA ExecPlats have access to BA First Lounges in London. However they cannot upgrade on BA anywhere using miles or certs.
Also why would you go to Asia via London? You could use CX to get there faster for a more reasonable amount of miles. However if you must, AA has a 1 world award that would let you fly in first SEA-LHR-HKG-SEA for 180,000 miles. You could use BA and CX for all flights execpt transatlantic.
Having said all that you could also investigate Alaskan. The will give you miles on NW, AA, and BA. They also offer BA awards at what appeared to me to be the same mileage level as BA Executive Club.
rich
[This message has been edited by RichLond (edited 09-14-2000).]