I'm sure my AA RLOC came up pretty much immediately. Obviously you might have to wait for the e-ticket to be generated...
Is strange however - both CMT and BA.com still have me in the seat I was automatically assigned to, but AA.com shows the one I moved myself into (with the previous seat now showing as free).
Somewhat academic though - a 2.5hr flight in an MD80 so not much to shout about between the seats. I'm more concerned about my first venture on BA with no access to pre-seating (without paying) since they brought in the new policy.
Re: OLCI - will it open for me 24hrs before the AA flight leaves, or 24hrs before the BA one does?