<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by andrzej:
What if any chance to get upgraded, being AA Gold and becoming Plat on the way there? </font>
Unless the plane is full in economy then you have no chance whatsoever. If it is full then the following people will be ahead of you for upgrades:
Marco Polo Invitation, Diamond, Gold & Silver.
All other OneWorld Emerald & Sapphire members.
My guess is that there might be at least 20 of these on the flights you mention, so all in all I would say your chances are pretty much zero.