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-ion battery ...

Passengers aboard a Southwest Airline jet that took a dramatic plunge to avoid an oncoming aircraft were told by the pilot that they nearly struck another plane before landing safely in Las Vegas.

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.

Southwest passengers will be required to keep portable chargers in plain sight while using them because of concerns about lithium ion battery fires.