At the end of the 18-month provisional period, Mexico-domiciled carriers that demonstrate acceptable levels of safety performance, pass the PASA, have no outstanding enforcement or safety improvement actions pending and receive a Satisfactory rating on the CR will be notified they have received standard operating authority. Once Mexico-domiciled carriers have been issued their standard operating authority, they remain subject to the limits on operating authority noted above—see section Limits on Operations in the U.S.—and safety performance oversight. They also must continue displaying current CVSA decals on their power units operating in the U.S. for 3 years after standard operating authority is granted.