A Delta Air Lines flight from Paris to Atlanta was diverted Thursday after passengers reported smelling smoke in the cabin.
It was unclear where the smoke came from, and no injuries were reported, Delta spokeswoman Betsy Talton said.
Delta Flight 21 originated at Charles de Gaulle Airport and was en route to Hartsfield-Jackson International Airport. The plane made an emergency landing after 1:30 p.m. at McGhee-Tyson Airport in Knoxville, officials said.
The passengers boarded another Delta aircraft four hours later to take them to Atlanta.
Normal traffic at the Knoxville airport resumed shortly after the landing, an airport official said.
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A maintenance crew was examining the aircraft in Louisville to find out what caused the smoke.
A flight attendant smelled smoke and noticed a small amount of smoke in the cabin when the aircraft reached about 500 feet.
Delta Air Lines Flight 511 was over the Pacific Ocean when the passenger hit a pilot, who had left the cockpit to quell the disturbance. The plane was then diverted to San Francisco.
The man had apparently tampered with the smoke detector, and ceiling tiles had also been moved.