On February 20, 2015 (80 FR 9217), the Pipeline and Hazardous Materials Safety Administration (PHMSA) published an extension of compliance in the federal register for the transportation of lithium cells and batteries. PHMSA is extending the mandatory compliance date of a final rule published on August 6, 2014 (HM–224F, 79 FR 46012) for modes of transportation other than air, from February 6, 2015 until August 7, 2015. This extension is made in response to formal comments received from multiple stakeholders outlining challenges faced by the regulated community in fully implementing the provisions of the final rule by the February 6, 2015 mandatory compliance date, particularly for surface transportation and the retail sector. PHMSA believes that maintaining the February 6, 2015 compliance date for air transport is appropriate and important for aviation safety and is therefore maintaining the February 6, 2015 effective date for offering, acceptance and transportation by aircraft. For all other modes of transportation, the compliance date for the HM-224F final rule published August 6, 2014 (79 FR 46012) is extended until August 7, 2015.