To maintain a safe and efficient nationwide system of public-use airports that meets the present and future needs of civil aeronautics, the Secretary of Transportation may make project grants under this subchapter from the Airport and Airway Trust Fund.

The Secretary may incur obligations to make grants from amounts made available under section 48103 of this title as soon as the amounts are apportioned under section 47114(c) and (d)(2) of this title.

After September 30, 2023, the Secretary may not incur obligations under subsection (b) of this section, except for obligations of amounts—

(1) remaining available after that date under section 47117(b) of this title; or

(2) recovered by the United States Government from grants made under this chapter if the amounts are obligated only for increases under section 47108(b)(2) and (3) of this title in the maximum amount of obligations of the Government for any other grant made under this title.

(Pub. L. 103–272, § 1(e), July 5, 1994, 108 Stat. 1252; Pub. L. 103–305, title I, § 101(b), Aug. 23, 1994, 108 Stat. 1571; Pub. L. 103–429, § 6(63), Oct. 31, 1994, 108 Stat. 4385; Pub. L. 104–264, title I, § 101(b), Oct. 9, 1996, 110 Stat. 3216; Pub. L. 105–277, div. C, title I, § 110(b)(2), Oct. 21, 1998, 112 Stat. 2681–587; Pub. L. 106–6, § 2(b), Mar. 31, 1999, 113 Stat. 10; Pub. L. 106–31, title VI, § 6002(b), May 21, 1999, 113 Stat. 113; Pub. L. 106–59, § 1(b), Sept. 29, 1999, 113 Stat. 482; Pub. L. 106–181, title I, § 101(b), Apr. 5, 2000, 114 Stat. 65; Pub. L. 108–176, title I, § 101(b), Dec. 12, 2003, 117 Stat. 2494; Pub. L. 110–190, § 4(b), Feb. 28, 2008, 122 Stat. 644; Pub. L. 110–253, § 4(b), June 30, 2008, 122 Stat. 2418; Pub. L. 110–330, § 4(b), Sept. 30, 2008, 122 Stat. 3718; Pub. L. 111–12, § 4(b), Mar. 30, 2009, 123 Stat. 1458; Pub. L. 111–69, § 4(b), Oct. 1, 2009, 123 Stat. 2055; Pub. L. 111–116, § 4(b), Dec. 16, 2009, 123 Stat. 3032; Pub. L. 111–153, § 4(b), Mar. 31, 2010, 124 Stat. 1085; Pub. L. 111–161, § 4(b), Apr. 30, 2010, 124 Stat. 1127; Pub. L. 111–197, § 4(b), July 2, 2010, 124 Stat. 1354; Pub. L. 111–216, title I, § 103, Aug. 1, 2010, 124 Stat. 2349; Pub. L. 111–249, § 4(b), Sept. 30, 2010, 124 Stat. 2628; Pub. L. 111–329, § 4(b), Dec. 22, 2010, 124 Stat. 3567; Pub. L. 112–7, § 4(b), Mar. 31, 2011, 125 Stat. 32; Pub. L. 112–16, § 4(b), May 31, 2011, 125 Stat. 219; Pub. L. 112–21, § 4(b), June 29, 2011, 125 Stat. 234; Pub. L. 112–27, § 4(b), Aug. 5, 2011, 125 Stat. 271; Pub. L. 112–30, title II, § 204(b), Sept. 16, 2011, 125 Stat. 358; Pub. L. 112–91, § 4(b), Jan. 31, 2012, 126 Stat. 4; Pub. L. 112–95, title I, § 101(b), Feb. 14, 2012, 126 Stat. 15; Pub. L. 114–55, title I, § 101(b), Sept. 30, 2015, 129 Stat. 523; Pub. L. 114–141, title I, § 101(b), Mar. 30, 2016, 130 Stat. 323; Pub. L. 114–190, title I, § 1101(b), July 15, 2016, 130 Stat. 617; Pub. L. 115–63, title I, § 101(b), Sept. 29, 2017, 131 Stat. 1169; Pub. L. 115–141, div. M, title I, § 101(b), Mar. 23, 2018, 132 Stat. 1046; Pub. L. 115–254, div. B, title I, § 111(b), Oct. 5, 2018, 132 Stat. 3199.)