Last week, a woman managed to sneak onto the Delta flight and get to Paris. She had been held in Charles de Gaulle airport until Saturday.

Investigators are trying to determine how a woman got past multiple security checkpoints this week at New York’s JFK International Airport and boarded a plane to Paris, apparently hiding in the aircraft’s bathrooms during the flight.

Delta Air Lines recently witnessed a stowaway situation on their flight from New York to Paris. The incident took place last week when a woman flew to France without a ticket while spending most of the traveling time in the washroom. When she was set to return to the US, she caused a disturbance at the airport.