Originally Posted by
USAtoUK
Thanks for this info! My best guess is that there will be (from London) 3 round trips to North America. 1 to Asia, and 7 to Europe each year. For USA domestic, I am guessing 3 round trips per year.
Well, given that, these seem to be your two choices (assuming availability):
1. Fly J on int'l flights and Y on US domestic flights
2. Fly WT+ on int'l flights and F on US domestic flights
If you like option 1 then take BA's program so you can book WT+ on the NA/Asia flights and upgrade to J w/miles, but if option two suits you better than pick AA so you can accumulate a lot of elite qualifying points quickly (w/their treatment of WT+ bookings) and upgrade on cheap US-domestic fares.
Were it me I'd probably accumulate on BA through flying and keep an AA credit card so I could accumulate mileage to use for domestic US upgrades.