You should have access, provided the stop in ORD is a connection, not a stopover.
This is the AA rule:
Originally Posted by aa.com
Credentials required: oneworld customers must produce government-issued photo identification and, an Emerald or Sapphire frequent flyer membership card or, a First or Business Class boarding pass for the journey’s international segment on the same day or before 6:00 a.m. the following day. Stopovers are not permitted.