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Passengers on Southwest Airlines flights will soon be required to keep their portable chargers in plain sight while using them because of concerns about the growing number of lithium battery fires in a new policy that other airlines may adopt.

Southwest announced the new policy that will go into effect May 28 and said passengers may already have seen notifications about the industry-leading rule when using the airline’s app.

There is growing concern about lithium-ion battery fires on planes because the number of incidents continues to grow yearly, and devices powered by those batteries are ubiquitous. There have already been 19 incidents involving these batteries this year, following last year’s record high of 89, according to Federal Aviation Administration .

The incidents have more than doubled since the pandemic-era low of 39 in 2020, and have climbed annually.

Compared to the roughly 180,000 flights U.S. airlines operate each week, the number of incidents is still relatively small and lithium batteries can overheat anywhere. However, this is a growing concern for the airlines.

Last summer, a smoking laptop in a passenger鈥檚 bag led to the evacuation of a plane awaiting takeoff at San Francisco International Airport. In 2023, a flight from Dallas to Orlando, Florida, made an emergency landing in Jacksonville, Florida, after a battery caught fire in an overhead bin.

Southwest said that requiring these chargers to be kept out in the open when they are being used will help because 鈥渋n the rare event a lithium battery overheats or catches fire, quick access is critical and keeping power banks in plain sight allow for faster intervention and helps protect everyone onboard.鈥�

The airline will allow the chargers to be stored inside carry-on bags when they aren’t in use.

The Transportation Security Administration has long prohibited e-cigarettes and chargers and power banks with lithium-ion batteries in checked bags, but . The rule exists precisely because fires in the cargo hold might be harder to detect and extinguish.

The FAA recommends passengers keep cell phones and other devices nearby on planes so they can access them quickly. The agency said flight crews are trained to recognize and respond to lithium battery fires. Passengers should notify the flight crew immediately if their lithium battery or device is overheating, expanding, smoking or burning.

A previous released last year by UL Standards & Engagement said e-cigarettes overheated more often than any other device. More than one-quarter of passengers surveyed for that study said they put vaping cigarettes and portable chargers in checked bags. That is against federal rules.

UL Standards & Engagement, part of a safety-science company once known as Underwriters Laboratories, said it based its findings on data from 35 passenger and cargo airlines, including nine of the 10 leading U.S. passenger carriers.