Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
AA partner CX offers direct service from SIN to BKK.
As noted, you must call AA to book award travel on CX or JL; aa.com is incapable of displaying (or booking) award seats on those carriers.