Don't forget, we have to wait for JL to actually join Oneworld officially for this unofficially stated "rule" to apply. Don't start booking those Fri/Sat ORD-NRT flights only in hopes of an invol reroute just quite yet...

BA might be good to reap the windfall of this new unofficial "rule" on, especially LAX-LHR if one has a second Oneworld account to credit the flight...