AAR Mobility Systems Awarded a $125 Million Sole Source Firm-Fixed-Price (FFP) Contract From the US Air Force to Produce and Repair 463L Cargo Pallets ( AAR CORP. ) AAR's Mobility Systems division has been awarded a sole source firm-fixed-price (FFP) requirements contract that includes a base year with four one year option periods from the U.S. Air Force for the production and repair of 463L cargo pallets. The total contract value is $125 million.