EXTENSION OF AIRPORT IMPROVEMENT PROGRAM.

SEC. 4. EXTENSION OF AIRPORT IMPROVEMENT PROGRAM. (a) Authorization of Appropriations.— (1) In general.—Section 48103 of title 49, United States Code, is amended by striking paragraph (8) and inserting the following: “(8) $3,380,178,082 for the period beginning on October 1, 2010, and ending on September 16, 2011.” . (2) Obligation of amounts.—Subject to limitations specified in advance in appropriation Acts, sums made available pursuant to the amendment made by paragraph (1) may be obligated at any time through September 30, 2011, and shall remain available until expended. (b) [49 U.S.C. 47104] Project Grant Authority.—Section 47104(c) of such title is amended by striking “July 22, 2011,” and inserting “September 16, 2011,”.