1. Short title This Act may be cited as the Advancing Infrastructure Development in Appalachia Act or the AID in Appalachia Act . 2. Balance exchanges for infrastructure program (a) In general Chapter 1 of title 23, United States Code, is amended by adding at the end the following: 171. Balance exchanges for infrastructure program (a) Definitions In this section: (1) Administratively allocated The term administratively allocated means the allocation by the Secretary of budget authority for a project under the TIFIA program that occurs when— (A) a potential applicant has been invited into the creditworthiness phase for a project under the TIFIA program; or (B) the project is subject to a master credit agreement (as defined in section 601(a)), in accordance with section 602(b)(2). (2) Appalachian state The term Appalachian State means a State that contains 1 or more counties in the Appalachian region (as defined in section 14102(a) of title 40). (3) Program The term program means the Balance Exchanges for Infrastructure Program established under subsection (b). (4) TIFIA carryover balance (A) In general The term TIFIA carryover balance means the amounts made available for the TIFIA program for previous fiscal years that are unobligated and have not been administratively allocated. (B) Inclusion The term TIFIA carryover balance includes— (i) the applicable amount of contract authority for the amounts described in subparagraph (A)