The programs funded through the Highway Trust Fund are currently authorized by an extension of the FAST Act (Division B of Public Law 116-159). That extension:
Extended funding for surface transportation through 2021 and
Transferred $13.6 billion to the Highway Trust Fund.
Activities funded through the Airport and Airway Trust Fund are currently authorized by the FAA Reauthorization Act of 2018 (Public Law 115-254). That law authorized FAA programs through fiscal year 2023.