On October 18, 2018 (83 FR 52878) the Pipeline and Hazardous Materials Safety Administration (PHMSA), in consultation with the Federal Aviation Administration, issued a final rule to align the U.S. Hazardous Materials Regulations with current international standards for the air transportation of hazardous materials. These amendments revise certain special provisions, packaging requirements, information to the pilot-in-command requirements, and exceptions for passengers and crewmembers. In addition to facilitating harmonization with international standards, several of the amendments in this rule are responsive to petitions for rulemaking submitted by the regulated community. Effective date: This rule is effective October 18, 2018. Delayed compliance date: Unless otherwise specified, compliance with the amendments adopted in this final rule is required beginning October 18, 2019.