Authorities in the United States have reviewed airport security footage as they continue to investigate how a woman sneaked on board a Delta Air Lines flight from New York to Paris without a ticket last Tuesday –– one of the busiest travel days of the year.

A passenger who recently fooled authorities and flew from New York to Paris on a Delta flight without a ticket or relevant documents is still in France. She was supposed to be deported to the US on a return Delta flight,

A passenger went through security screening but avoided identity and boarding pass checks before flying out of the United States, a T.S.A. representative said.