(BBC News) South Korea's national airline has used electric stun guns on five passengers during flights, the BBC has learned.
Korean Air is believed to be the only major carrier to routinely have the weapons on board.
The airline is ramping up training for staff using the guns after criticism for the way it handled a recent in-flight disturbance.
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In that incident, US singer Richard Marx was among passengers who helped restrain an unruly passenger.
Afterward both Mr Marx and his wife Daisy Fuentes used social media to claim that the crew was "ill-trained".