At the largest terminal at New York’s John F. Kennedy International Airport on one of the busiest travel days of the year, security lapses enabled an unticketed passenger to board a plane to Paris in a shocking breach that one aviation expert said should serve as a “wake-up call” for the airline industry.

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

New details on how a woman managed to sneak onto a Delta flight from New York to Paris have raised serious questions about security during the busy holiday travel season.