Both Delta flights landed without incident, after authorities reportedly received telephone threats of a hijacking.
The man being questioned by law enforcement authorities was on Delta flight 119, and has not been arrested, according to CBS's John Hartge. Officials have given no word on whether his name appears on a terror watch list.
All other passengers and crew from both Delta flight 119 and Delta flight 81 have been released.
A spokeswoman for the Transportation Security Administration confirms that there was a hijack threat called in to the National Transportation Safety Board concerning the flight from Paris. She says the plane was isolated in New York, and authorities have questioned the passengers, who have been allowed off the plane.
She says authorities are also questioning passengers on the other flight. However, Hartge reports that no threat actually came in regarding Delta flight 81, but that there had been initial confusion about the threat because the flights landed three minutes apart.
The spokeswoman says Delta reports that both flights were routine.