Wirelessly posted (BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
"Your best bet is to transfer Starpoints to AA for the most efficient redemption, though you run a risk of getting left hanging since Starpoints do not transfer instantly (SPGAA will likely take a couple of days to a week, depending on what day of the week you initiate the transfer; I believe Starwood does a weekly "sweep")."
AA permits award reservations to be held for up to five days at no charge. That might be long enough for the Starpoints to be converted to AAdvantage miles.