India, June 1 -- A transatlantic United Airlines flight was forced to execute a high-stakes mid-Atlantic U-turn on Sunday, leaving passengers stranded and the federal authorities on high alert, after a teenage traveller's choice of Bluetooth device name sparked a massive security scare.

United Airlines Flight 236, bound for Palma de Mallorca, Spain, was roughly an hour into its journey when crew members discovered a device on the cabin network explicitly named "BOMB."

The discovery triggered an immediate and aggressive emergency response. According to passengers on board, the cabin crew began issuing urgent, repeated instructions over the public address system, demanding that every passenger disable their Bluetooth connectivity immediatel...