A few years ago, my airline started training us on spotting telltale signs of human trafficking on the plane. Can the passenger speak for themselves, or is someone with them controlling what they say? Does the passenger avoid eye contact? Do they appear fearful, anxious, tense, depressed, nervous, submissive? Are they dressed inappropriately, or do they have few possessions — even on a long flight? Can the passenger move independently, or are they accompanied by someone seemingly controlling their every movement?