Screening TechnologyInfants and small children may be carried through the metal detector. Should the alarm sound, additional screening is required.
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In the US, travelers are allowed to refuse to go through the body scanner and opt for a physical search instead. Passengers who have been selected for enhanced screening, however, cannot opt out of the full-body scanner.
By signing up for TSA Precheck, travelers can not only keep their personal items packed and shoes on but also avoid body scanners most times they fly. Instead, travelers will be able to pass through the dedicated Precheck line, which includes passing through a metal detector.
The good news is it's not your only choice. In fact, the TSA does allow you to opt out of going through the full-body scanner machines. All you have to do is inform the TSA agent at the checkpoint that you would like to opt out, at which point you will be welcomed into the departure area with a wave and a smile.
Children 13 to 17 may be randomly excluded from receiving TSA PreCheck® on their boarding pass. In these cases, they must go through standard security screening.
Children between the ages of 13 and 17 who will be traveling on the same reservation as an enrolled parent or guardian may also access the TSA PreCheck® lanes, provided the children have the TSA PreCheck® indicator on their boarding pass.
If you do initially refuse a pat down, the TSAO will offer you a final chance to change your mind. If you still refuse, they will call the airport police, who will escort you away from the security checkpoint. At that point, your options are done; you won't be allowed to re-enter the security checkpoint.
The minimum age for children to travel alone as adults paying adult fares varies: Kids have to be 12 years old to fly alone on domestic flights with Hawaiian, Southwest, Air Canada, and WestJet; 13 years old on Alaska; 14 years old to fly as an adult on JetBlue; and 15 years old on Allegiant, American, Delta, Frontier, ...
International travelSome airlines automatically apply the unaccompanied-minor procedures to kids through age 17 on international flights, and charge the standard unaccompanied-minor fee if applicable. Children must usually have the same passport, visa or other international entry documentation required of adults.
Technically your spouse can't go through the TSA PreCheck lane without their own account. In some instances, however, security may allow them through when it's clear that their boarding passes match yours as the primary account holder.