There has been some concern, possibly competition-related, from freighter operators about whether the rules on carrying cargo on passenger aircraft are as thorough as they are for freighters. But the new US safety alert includes information on weight, balance, fire suppression and dangerous goods – which much of the medical equipment currently flying, is. Dangerous goods cannot be carried on the upper deck of passenger aircraft. The FAA also recommends at least one crew member travelling in the cabin so as to be on hand if fire breaks out. Freightwaves reports.