Passengers 18 and over need ID, so your son will not.
Acceptable forms per the TSA are:
Acceptable IDs include:
U.S. passport
U.S. passport card
DHS "Trusted Traveler" cards (NEXUS, SENTRI, FAST)
U.S. Military ID (active duty or retired military and their dependents, and DOD civilians)
Permanent Resident Card
Border Crossing Card
DHS-designated enhanced driver's license
Drivers Licenses or other state photo identity cards issued by Department of Motor Vehicles (or equivalent)
A Native American Tribal Photo ID
An airline or airport-issued ID (if issued under a TSA-approved security plan)
A foreign government-issued passport
Canadian provincial driver's license or Indian and Northern Affairs Canada (INAC) card
Transportation Worker Identification Credential (TWIC)
Ok sorry - but IMHO the exceptions are so rare that posting about them only confuses people.
99.9% of the time only passengers 18 and over need ID to clear security and for the airlines.
The exception is for an "age qualified fare". Most common are lap riders (babies under 2) senior fares and occasionally child fares. The childs ID is not ]necessary to fly but to prove you quilify for the special fare. FWIW the child fares are often more expensive than adult web fares so folks rarely buy them. Since you can't make these reservations on line and have to make the reservation via phone the rep will tell you that you have purchased a special fare and what documents you will need. If the child is already been age verified then no ID is necessary even with a lap rider or child fare.
So if the OP purchased web fares via SWA.com the 5yo does not need ID.
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