A Delta Air Lines flight from Los Angeles to Atlanta resumed its flight Friday after being diverted to Oklahoma City a day earlier.

The airline said in a statement that the flight was diverted "out of an abundance of caution due to an onboard medical issue."

Passengers told KOCO-TV that at least three flight attendants began feeling sick during the flight Thursday.

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"They told us they were having trouble breathing and that there was something about them being nauseous in heat," passenger Emmy Kelly said. "They didn’t give us a ton of information."

"The head stewardess was actually having trouble breathing at some point," another passenger, Greg Everett, said. "She was seated and using the oxygen mask."

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Emergency Medical Services Authority spokesperson Adam Paluka said three people were transported by ambulance from the airport to a hospital. Their conditions were not released.

The Boeing 757 aircraft landed at Will Rogers World Airport shortly before 6 p.m., according to the flight tracking website FlightAware.

Delta said in the statement that the flight resumed shortly before noon Friday.