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Pursuant to a congressional request, GAO reviewed: (1) what types of Air Improvement Program (AIP) projects are currently being funded by letters of intent; (2) how much funding remains to be paid under these letters; (3) what share of the projects' total costs these letters cover and what other sources of funding the projects have; and (4) what percentage of AIP discretionary funding the letters of intent represent for fiscal year 1999 through fiscal year 2004.

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