Centers for Disease Control and Prevention (HHS), CDC Order, Requirement for Persons To Wear Masks While on Conveyances and at Transportation Hubs, 86 Fed. Reg. 8025 (Feb. 3, 2021; effective Feb. 1, 2021) (Jan. 29, 2021) (Ex. ECO-B-004)
Transportation Security Administration (DHS), TSA Security Directives SD 1582/84-21-01, -01A, -01B (surface transportation; Jan. 31, Apr. 30, Aug. 20, 2021); SD 1544-21-02 (aircraft operators) and SD 1542-21-01 (airports) (Jan. 31, 2021); ratification 86 Fed. Reg. 26825 (Ex. ECO-B-005)
