Security officials screened the boy at airport shortly after 10:30 a.m. Thursday, Metropolitan Airports Commission spokesman Patrick Hogan said. The boy then boarded a Delta flight that left for Las Vegas at 11:15 a.m.
The flight crew became suspicious and contacted Las Vegas police, who met the crew upon landing and transferred the boy to child protection services, Hogan said.
Video also shows the boy at the airport Wednesday, Hogan said. He grabbed a bag from the carousel and ordered lunch at a restaurant outside of the security checkpoints, Hogan said. He ate and then told the server he had to use the bathroom, left the bag and never returned to pay. The owner of the bag was identified, and the bag was returned to him, Hogan said.
Delta and the Transportation Security Agency said in separate statements that they were investigating.