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.

A stowaway who allegedly boarded a Delta Air Lines flight without a boarding pass wasn’t discovered until shortly before the plane touched down in Paris. The unidentified woman was caught onboard the fully booked Delta flight 264 on Wednesday (27 November) when a flight attendant became suspicious of the passenger’s long stints in the aircraft bathrooms.

A woman who tried to hide in an airplane bathroom during a flight from New York to Paris was only caught right before landing.