X0303 4 2011-04-25 0 0000912145 AMERISTAR CASINOS INC ASCA 0001051359 PAR CAPITAL MANAGEMENT INC ONE INTERNATIONAL PLACE SUITE 2401 BOSTON MA 02110 0 0 1 0 0001066867 PAR INVESTMENT PARTNERS LP ONE INTERNATIONAL PLACE, SUITE 2401 BOSTON MA 02110 0 0 1 0 0001341061 PAR Group, L.P. ONE INTERNATIONAL PLACE SUITE 2401 BOSTON MA 02110 0 0 1 0 Common Stock 2011-04-25 4 S 0 44294 19.53 D 3325244 D Common Stock 2011-04-26 4 S 0 4632 19.51 D 3320612 D These securities are held directly by PAR Investment Partners, L.P. ("PIP"). PAR Group, L.P. ("PAR Group") is the general partner of PIP and PAR Capital Management, Inc. ("PCM") is the general partner of PAR Group. Each of PCM and PAR Group disclaims beneficial ownership of these securities except to the extent of their respective pecuniary interests therein, if any, as a result of their direct or indirect ownership interests in PIP and a contingent right on the part of PAR Group to receive a performance-based incentive allocation from PIP. Steven M. Smith, Chief Operating Officer and General Counsel 2011-04-27