Meet Shelia Fedrick.
She is a flight attendant and this day she noticed a teenage girl flying with an older man. Obvious there's nothing strange about this however she noticed the man was VERY well-dressed and the girl looked 'unkempt.'
Also, whenever she asked the girl a simple question, the creepy man would answer.
So Shelia had a genius idea.
She told the young girl quietly to go to the bathroom and she left a note on the mirror for her. The little girl's response was horrifying.
Shelia told the pilot about what was going on and once the plane landed... police apprehended the man. Yes, it turns out the girl was a victim of human trafficking.
Source: Little Things