Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
First of all, it should only be 9,000 Avios (4,500 + 4,500),
not 13,500 Avios.
Second, even on separate tickets, you are protected when connecting between AA and any oneworld carrier. You will be treated as a through-ticketed passenger:
http://www.aa.com/i18n/agency/Bookin...tkt_policy.jsp