The Directorate General of Civil Aviation, has advised passengers not to carry models of 15-inch MacBook Pro laptops that Apple deemed a safety risk due to overheating batteries. Affected units were sold primarily between September 2015 and February 2017 and product eligibility is determined by the product serial number. Apple has determined that, in a limited number of older generation 15-inch MacBook Pro units, the battery may overheat and pose a fire safety risk.