Southwest Airlines is about to implement a new safety measure that could shake up the industry. According to The Seattle Times, there have been 19 incidents on planes this year involving lithium-ion batteries.

Southwest Airlines is implementing a surprising new restriction on portable chargers to keep these notoriously incendiary devices from bursting into flame mid-flight. Starting on May 28, passengers will be required to keep their power banks in plain sight, making the budget carrier the first to roll out a policy of this kind.