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 woman shockingly boarded a Delta Air Lines flight from New York to Paris without a ticket or proper documentation despite the airport’s stringent security measures. The breach in security happened on November 26,

French officials tell ABC News that the woman who allegedly snuck onto a Delta Airlines international flight is a Russian national who did not have valid travel documents to enter the country.