Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
Sure: go on the AA, DL, and UA websites and see what options are presented for your desired itinerary. On aa.com, ignore the BA options, unless you are willing to pay the hefty surcharges for travel on BA metal.
Also, be aware that both AA and UA offer one-way awards. That might open up more redemption options for you. (If you find a roundtrip on Star Alliance metal offered at united.com, you should also be able to redeem US miles for the same flights.)