So I'm flying SNA-SFO on UA tomorrow morning and then flying AA SFO-LAX and then AA LAX-LHR later in the day (one way to avoid the 405 I guess). I am IB Platino (OW Emerald). Would I be able to have access to the AC in SNA even though I'm not flying on AA from there based on a same day AA flight? Completely understandable if not, but figured it's worth asking.