A young passenger and an adult are traveling together but don't look alike and don't have the same last name.
Sources: A flight attendant for Delta Air Lines and a flight attendant for United Airlines who spoke with Business Insider on condition of anonymity.
A young passenger is traveling without luggage.
Sources: A Delta flight attendant on condition of anonymity, Brady Byrnes
An adult traveling companion does not allow a young passenger to place a drink order or talk to the flight attendant about where he or she is traveling.
Sources: A Delta flight attendant and a flight attendant for Envoy Air who spoke with Business Insider on condition of anonymity, Sally Ann MacLagan (a flight attendant for Mesa Airlines), Alexandrea Tiller (a flight attendant for Spirit Airlines), Brady Byrnes
A young passenger is constantly being watched by an adult companion.
Source: A Delta flight attendant who spoke with Business Insider on condition of anonymity
When asked about his or her trip, a young passenger's answers frequently change.
Source: Sally Ann MacLagan
A young passenger's hand stays very close to an adult's hand, possibly concealing a handcuff.
Source: Sally Ann MacLagan
A young passenger won't acknowledge or make eye contact with the flight attendant.
Sources: Alexandrea Tiller, a flight attendant for Envoy Air, a flight attendant for United Airlines who to spoke to Business Insider on condition of anonymity, Brady Byrnes
A young passenger can't go to the bathroom without being accompanied by an adult.
Source: Alexandrea Tiller
Are you a flight attendant? Do you have a story to share? Contact this reporter at mmatousek@businessinsider.com.
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