As requested, this correspondence discusses our findings on whether the net excise tax revenue distributed to the Airport and Airway Trust Fund (AATF) for the fiscal year ended September 30, 2011, is supported by the underlying records. The Department of Transportation's Inspector General is responsible for the adequacy of these agreed-upon procedures to meet the inspector's objectives, and we make no representation in that respect. The procedures we agreed to perform were related to (1) transactions that represent the underlying basis of amounts distributed from the general fund to the AATF during fiscal year 2011, (2) the Internal Revenue Service's (IRS) quarterly AATF excise tax receipt certifications prepared during fiscal year 2011, (3) the U.S. Department of the Treasury's Financial Management Service adjustments to AATF excise tax distributions during fiscal year 2011, (4) the U.S. Department of the Treasury's Office of Tax Analysis's (OTA) estimates of excise tax amounts to be distributed to the AATF for the fourth quarter of fiscal year 2011, (5) adjustments to the AATF for tax on kerosene used in aviation during fiscal year 2011, and (6) the amount of net excise taxes distributed to the AATF during fiscal year 2011.

We were not engaged to perform, and did not perform, an examination, the objective of which would have been to express an opinion on the amount of net excise taxes distributed to the AATF during fiscal year 2011. Accordingly, we do not express such an opinion. Had we performed additional procedures, other matters might have come to our attention that we would have reported to the Department of Transportation's Inspector General. We completed the agreed-upon procedures on October 26, 2011.