I don't know if this has been posted anywhere, but this seems to confirm that the ATR will in fact be gone by the end of 2013.
Pulled this from AMR's 10-K filing:
In accordance with Section 1110 of the Bankruptcy Code, the Company is currently negotiating with creditors and lessors to restructure certain of its existing financings to reduce its debt burden and optimize its fleet. As of December 31, 2011, the Company had rejected 24 aircraft leases relating to 20 MD-80 aircraft and four Fokker 100 aircraft. In addition, since December 31, 2011, the Company has rejected an additional 9 aircraft leases and mortgages relating to one MD-80 aircraft, seven Boeing 757-200 aircraft, and one Airbus A300-600R aircraft. In addition, the Company filed a motion with the Bankruptcy Court to modify the leases of the Super ATR aircraft. As of February 15, 2012, 21 of the aircraft had been returned to the lessor as allowed under the modified agreement. The remaining 18 aircraft will be returned to the lessor during 2012 and 2013. In January 2012, American entered into agreements under Section 1110(a) of the Bankruptcy Code to retain 350 aircraft, including Boeing 737-800, Boeing 757-200, Boeing 767-300ER, Boeing 777-200ER, Bombardier CRJ-700, and McDonnell Douglas MD-80 aircraft on the terms provided in the related financing documents.