When flight attendant Sheila Fedrick spotted a dishevelled girl on an Alaska Airlines flight from Seattle to San Francisco, she knew something was wrong.
The teenager "looked like she had been through pure hell", the flight attendant told NBC and the well-dressed man she was travelling with would not allow the girl to be spoken to.
Fedrick tried to engage them in conversation, but the man became defensive, she said.
On instinct, the Fedrick left a note for the girl in one of the bathrooms on board the aircraft.
"I left a note in one of the bathrooms," Fedrick said. "She wrote back on the note and said 'I need help.'"