(Chicago, IL) — United Airlines is reminding employees to refrain from using duct tape to restrain unruly passengers. Senior Vice President for Inflight Services John Slater recently issued a staff memo urging flight attendants to use “alternative measures” to deescalate situations, adding that “tape should never be used.” Slater was referring to at least three incidents involving duct tape used on passengers on American Airlines and Frontier flights. Attendants were also directed to use the safety manual to guide decision-making if they feel a customer should be denied service. The memo came soon after American flight attendants restrained a woman with tape after she tried to open the plane’s doors during a flight.