Children. TSA does not require children under 18 to provide identification when traveling within the United States. Contact the airline for questions regarding specific ID requirements for travelers under 18.
Does Delta Airlines require ID?
Travel Within the U.S. In the United States, you need a valid U.S. government-issued photo ID or a passport from your country of origin to travel through security. You must show that the name on your boarding pass matches the legal name on your unexpired government-issued ID.