This Reauthorization Program Guidance Letter (R‐PGL) 19‐04 explains and implements provisions in the FAA Reauthorization Act of 2018 (the 2018 Act) (P.L. 115‐254) that establish or sunset pilot programs under 49 U.S.C., Chapter 471 (the primary statutory provision governing the Airport Improvement Program (AIP)). This R‐PGL also references pilot programs under the authority of the Transportation Security Administration (TSA) for clarity purposes. This R‐PGL is directed to Office of Airports’ staff for the purpose of helping them implement statutory changes. This R‐PGL is not legally binding in its own right and will not be relied upon by the FAA as a separate basis for affirmative enforcement action or other administrative penalty.