I am new here and I'm sure with all the 'seasoned' f/f's here this question will seem silly but here goes....

I am a member of BA's frequent flyer program and also a member of AA's, though very low miles in each.

I suspect I will be using BA more than AA. Since they are both members of the OneWorld program, can I book an AA ticket but put the miles in my BA account?

Or is it that only when you have enough miles to redeem, that you can use any airline belonging to the OneWorld program?

It is just confusing because on BA's website they say you can earn miles on any of the other airline partners, but I'm not sure how to get the AA miles to the BA account. At present I am yet to book my AA ticket, I was wondering if there is something I should be doing before I book to get the miles on the BA account.

Thank you.