I just signed up for the British Airways CC last week (same deal as the one you mentioned--you get 100k miles). It looks like they just decreased it to 50k though. AA is a partner airline so you can use the miles on that airline too (among others).
"Earn 25,000 bonus BA Miles after your first purchase plus an additional 25,000 bonus BA Miles when you spend $2,500 in the first 90 days."
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