Originally Posted by SAT Lawyer

The CFR that permits its use is permitted on the back of the vest in case you need to educate a flight attendant. Moreover, the manufacturer will give you a $50 refund check if a flight attendant/airline refuses to permit its use. Finally, while it is not technically permitted for use during takeoff and landing, fat chance of that prohibition being enforced on most flights with the flight attendants generally not in the line of sight when they strap themselves into their jump seats.