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 was removed from the plane by law enforcement after landing at Charles de Gaulle Airport, a source with knowledge of the incident told NBC News.

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.