The ID requirements for minors traveling on domestic airline flights differ from the rules for international flights. While no ID is mandatory, airlines can request proof of a minor's age for travel.
You typically need a doctor's approval letter to fly with a newborn. The definition of a newborn varies with each airline, but this is typically a child younger than 7 days old.
An airline may request a birth certificate to determine whether a child is younger than 2 years old. You can present a passport instead.
Minors who take advantage of discounted children’s fares may have to show their birth certificates to prove eligibility.
Airlines can request proof of age, such as a birth certificate or passport, at the airport for any child younger than 18 years old.
It is generally a good idea to have a photo ID, such as a driver's license or state-issued ID card, for any teenager who may be traveling. A passport is another option.