S. 4246 would authorize the appropriation of $12.5 million in 2023 and 2024 for the Department of Transportation (DOT) to provide grants to nonfederal government entities to plan for infrastructure that can accommodate advanced air mobility (AAM) operations. AAM systems transport people or property using aircraft with innovative capabilities. The bill also would require DOT and the Government Accountability Office to report on the bill’s implementation. CBO estimates that enacting S. 4246 would not affect direct spending or revenues. CBO estimates that implementing the bill would increase discretionary costs by $25 million over the 2023-2027 period, assuming appropriation of the authorized amounts. The bill contains no intergovernmental or private-sector mandates as defined in the Unfunded Mandates Reform Act.