articleThe Brief A New York-bound Swiss International Air Lines flight diverted safely to Bangor, Maine, after smoke developed in the cabin. The airline said investigators determined the smoke was caused by a wireless headphone charging case that became jammed in a seat, damaging its lithium battery. A Swiss International Air Lines flight from Zurich to New York diverted to Bangor, Maine, after smoke developed in the aircraft's cabin, with investigators later determining the source was a damaged headphone charging case lodged in a passenger seat. The airline said flight attendants receive extensive training on handling onboard fires, smoke and lithium battery incidents. "There was explicitly and exclusively smoke in the cabin," the airline said, noting the smoke was confined to the forward section of the business-class cabin.