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.

The woman boarded Delta Flight No. 264 from John F. Kennedy International Airport to Paris Charles de Gaulle Airport, CBS News learned. She was discovered while the plane was in midair and was taken into custody in Paris.

It remains unclear how the person managed to bypass security at JFK Airport and board the Delta Air Lines flight to Paris.