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.

The same passenger who stowed away on a Delta Air Lines flight to Paris caused a disturbance on a flight to New York on Saturday, an aviation official said.

Officials say the woman is a Russian national who did not have a ticket when she boarded the plane at John F. Kennedy International Airport.