The person didn't leave the airport as they passed through, officials said.
She was told, "You're entering a different country without a passport. That's bad."
A lot of things changed after 9/11, but one of the biggest was the creation of the TSA.
According to Custom and Border Protection, the baby suffered a medical emergency during the flight. By the time the plane landed at 9:16 p.m., she was unresponsive, police said.
The flight was headed from Orlando to Philadelphia.
U.S. Customs and Border Protection computers are "back up and running" after an outage that snarled international arrivals, causing long lines at airports for travelers trying to enter the country.
