GAO assisted the Department of Transportation determine whether the net excise tax revenue distributed to the Airport and Airway Trust Fund (AATF) for fiscal year 2000 was supported by the underlying records. GAO agreed to (1) perform detailed tests of transactions that represent the underlying basis of amounts distributed to AATF, (2) review the Internal Revenue Service's (IRS) quarterly AATF certifications, (3) review the Department of the Treasury Financial Management Service adjustments to AATF for FY 2000, (4) review the Office of Tax Analysis process for estimating amounts to be distributed to AATF for the fourth quarter of FY 2000, (5) compare net excise tax distributions to AATF during FY 2000 and amounts reported in the financial statements prepared by the Bureau of the Public Debt for AATF and the Federal Aviation Administration's consolidated financial statements, and (6) review key reconciliations of IRS records to Treasury records.

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