I highly doubt you will have a problem - you booked the first at aa.com and the second at Orbitz.com. Since these two booking engines take time to reconcile themselves with one another it may never catch it or will catch it after the second ticket is issued.
Do yourself a favor, on the second booking don't input the same FF#. Have it input afterwards. Also, use a different credit card as payment - this will also reduce the chances that the system could flag you.