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 somehow made it onto a Delta Air Lines flight Tuesday from New York City to Paris without a boarding pass, officials confirmed.The woman boarded Delta Flight No. 264 from John F. Kennedy International Airport to Paris Charles de Gaulle Airport,

A stowaway passenger was removed from a Delta Air Lines flight by authorities in Paris on Wednesday after boarding a flight from New York. The woman went through full security screening, but managed to board the aircraft without a ticket.