This letter is to inform of amendments made to Exemption No. 18561, which was issued on May 20, 2020 in response to a petition by Airlines for America. The FAA has determined that the justification for the issuance of Exemption No. 18561 remains valid with respect to this exemption and is in the public interest. Therefore,  part 119 certificate holders conducting part 121 operations are hereby granted an exemption from 14 CFR §§ 91.9(a) and 121.153(a)(2). The petition is granted to the extent necessary to allow affected part 119 certificate holders conducting operations under part 121 to carry cargo on passenger seats on the main deck of transport category airplanes when no passengers are being transported, without classifying the main deck as one of the compartments defined in 14 CFR § 25.857. This exemption is subject to certain conditions and limitations.