As of 2026, the TSA PreCheck policy for families is quite accommodating. Children aged 12 and under can always accompany a parent or guardian who has TSA PreCheck through the dedicated lanes, provided the "TSA PRECHK" indicator appears on the child's boarding pass (which usually happens automatically if they are on the same reservation). For teenagers, the rules changed slightly in recent years: children aged 13 through 17 can also join their parents in the PreCheck lane, but only if they are traveling on the same airline reservation and the TSA PreCheck indicator is printed on their own boarding pass. If a teenager is traveling alone or on a separate reservation, they would need their own individual TSA PreCheck membership to use the lane. It is always important to ensure that the child's secure flight data (name and date of birth) exactly matches their identification and is correctly linked to the adult's Known Traveler Number (KTN) during the booking process.