Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
Note that AA and US each have several non-oneworld airline partners. I'm guessing that US' non-oneworld partners will only be available until the AA and US FFPs merge.
And US does not offer one-way redemptions; AA and BA do.