- Neither Delta nor the Transportation Security Administration require children, even unaccompanied minors, to carry identification information with them to board a flight. Children over the age of two or younger children who will be sitting in their own seat must have a ticket to board a Delta airplane.
- While Delta allows newborns on its flights, babies under a week old must have a doctor's note stating it is safe for them to fly. Delta's partner airlines have other newborn restrictions, with Comair requiring a letter for all infants under 12 days old and SkyWest not allowing infants under eight days of age aboard its planes. All unaccompanied minors must be checked in and picked up at the airport by an adult with photo identification such as a driver's license before being allowed to board the plane or leave the airport.
- Children flying on Delta Airlines internationally must hold a valid United States passport, according to the U.S. Department of State. All newborns and infants are also included in this requirement.