This Special Federal Aviation Regulation (SFAR) provides regulatory relief to persons who have been unable to comply with certain training, recent experience, testing, and checking requirements due to the Coronavirus Disease 2019 (COVID–19) outbreak. This relief allows operators to continue to use pilots and other crew members in support of essential operations during this period. Additionally, this SFAR provides regulatory relief to certain persons and pilot schools unable to meet duration and renewal requirements due to the outbreak. This rule also allows certain air carriers and operators to fly temporary overflow aircraft, a need resulting from the outbreak, to a point of storage pursuant to a special flight permit with a continuing authorization.

You can find more information at this NBAA website:

https://nbaa.org/press-releases/nbaa-applauds-faas-covid-19-relief-on-ga-pilot-medicals-proficiency-other-regulations/