; and (ii) for which, by not later than September 30, 2025, the Secretary has— (I) received a letter of interest; and (II) determined that the project is eligible for assistance; ; (B) in subparagraph (F), by striking the period at the end and inserting a semicolon; and (C) by adding at the end the following: (G) an eligible airport-related project (as defined in section 40117(a) of title 49) for which, not later than September 30, 2024, the Secretary has— (i) received a letter of interest; and (ii) determined that the project is eligible for assistance; and (H) a project for the acquisition of plant and wildlife habitat pursuant to a conservation plan that— (i) has been approved by the Secretary of the Interior pursuant to section 10 of the Endangered Species Act of 1973 ( 16 U.S.C. 1539 ); and (ii) in the judgment of the Secretary, would mitigate the environmental impacts of transportation infrastructure projects otherwise eligible for assistance under this title. . (b) Eligibility Section 602(a) of title 23, United States Code, is amended— (1) in paragraph (2)— (A) in subparagraph (A)(iv)— (i) by striking a rating and inserting an investment-grade rating ; and (ii) by striking $75,000,000 and inserting $150,000,000 ; and (B) in subparagraph (B)— (i) by striking the senior debt and inserting senior debt ; and (ii) by striking credit instrument is for an amount less than $75,000,000 and inserting total amount of other senior debt and the Federal credit instrument is less than $150,000,000 ; and (2) in paragraph (5)(B)(ii), by striking section 601(a)(12)(E) and inserting section 601(a)(13)(E) . (c) Processing timelines Section 602(d) of title 23, United States Code, is amended— (1) by redesignating paragraphs (1) and (2) as paragraphs (2) and (3), respectively; (2) in paragraph (3) (as so redesignated), by striking paragraph (1) and inserting paragraph (2)