Nov 28 (Reuters) - A passenger boarded a Delta Air Lines ( DAL )

flight from New York to Paris without a ticket, somehow

evading two boarding pass checks and leading both Delta and the

U.S. Transportation Security Administration to say they were

investigating how it happened.

French police boarded the plane in Paris and took the

stowaway into custody on Wednesday before the other passengers

were let off the plane, CNN reported, citing a ticketed

passenger who was onboard.

Delta Flight 264 left New York's JFK Airport on Tuesday

night and landed at Paris' Charles de Gaulle Airport on

Wednesday.

TSA said the person was physically screened before the

flight and boarded without any prohibited items.

"The individual bypassed two identity verification and

boarding status stations and boarded the aircraft," TSA said in

a statement, adding, "TSA will independently review the

circumstances of this incident at our travel document checker

station at JFK."

Passengers typically pass through at least two boarding pass

checks: one at the TSA screening checkpoint before entering the

boarding area and another by the airline at the gate.

"Nothing is of greater importance than matters of safety and

security. That's why Delta is conducting an exhaustive

investigation of what may have occurred and will work

collaboratively with other aviation stakeholders and law

enforcement to that end," Delta said in a statement.