Authorities are investigating after a Russian national who did not have a ticket boarded a Paris-bound Delta flight at New York's John F. Kennedy International Airport this week and was arrested when the plane touched down.

Investigators say they still don't know how a woman managed to get through security checkpoints and onto a flight from New York to Paris without a boarding pass on Tuesday night. Lilia Luciano spoke with a passenger on that 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.