British Airways has just announced that there will be an official announcement within the next 2 weeks or so about frequent flyer reciprocity with American Airlines.
Currently both AA and BA are members of OneWorld, but are unique in the fact that you cannot credit miles flown for transatlantic flights on one carrier to the other carrier. You also cannot redeem miles on one carrier for transatlantic travel on the other.
BA, which operates with 4 top-notch classes of service, generally has very good transatlantic mileage availability, especially in the 3 premium classes of service. This is due in large part to the difficulty of earning BA miles and the massive fuel surcharges that they levy on award tickets.
With AA miles being a whole lot easier to accumulate and due to AA not (yet) charging a fuel surcharge on award tickets, expect BA award availability to go way down once the official announcement is made…so make your plans now if you’d like to burn your AA miles on BA travel!