Welcome to FT,
Jenbel!
I'm a *A flyer, so this is
totally outwith my experience, but I saw you were from my home town so I had to reply to your post!
My understanding is that you want to be very careful about AA/BA if you fly transatlantic. If you're a UK based member of one FFP, you
can't earn miles when flying on the other carrier on a transatlantic route. Or something like that.
Have you had the first floods of the winter yet?