This excerpt taken from the AAPL 10-Q filed May 4, 2005.
Determination and Certification. After the end of each Performance Period, the Committee shall certify in writing (which may be by approval of the minutes in which the certification was made) the extent to which the Performance Goals applicable to each Participant for the Performance Period were achieved or exceeded. The Award for each Participant shall be determined by applying the Payout Formula to the level of actual performance that has been certified by the Committee. Notwithstanding any contrary provision of the Plan, the Committee, in its sole discretion, may eliminate or reduce the Award payable to any Participant below that which otherwise would be payable under the Payout Formula.