Originally Posted by
danger
American Airlines does have such a policy but I don't think oneworld has an alliance-wide policy.
My understanding is that there is such a policy but it's not public. That of course makes it less prudent to rely on, especially as no policy is enacted 100% of the time and a non-public policy is almost impossible to hold airline staff too if they aren't being co-operative.
There's a thread on this, the most useful post within which is probably this:
http://www.flyertalk.com/forum/24573519-post87.html