I'm looking at booking a ticket ORD-ATH via a 3rd party website. The ORD-LHR and vice versa is AA metal, but BA flight # (if you buy it as the AA # the fare spikes!). I have not been in this situation before and am wondering whether the PNR will come up on aa.com or only on ba.com, whether I can choose seats more than 24 hours ahead (alas, only AA Gold!), etc. or if I am stuck with my sad BAEC Blue status since it is a BA flight #. Thanks in advance!