A Southwest passenger's "battery charger apparently overheated and began to smoke," the airline said. Quick-thinking flight attendants contained it.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.

Southwest Airlines enforces a new policy requiring portable chargers to be kept in plain sight during flights to address growing concerns over lithium-ion battery fires.