CLEVELAND — Former President Jimmy Carter, on a trip promoting his new book, developed an upset stomach on a flight to Cleveland on Tuesday and was taken to a hospital, officials said.

Carter's grandson, Georgia state Sen. Jason Carter, said his 85-year-old grandfather was doing fine.

Carter was a passenger on a Delta Air Lines flight from Atlanta to Cleveland when he became ill. After the plane landed, he was taken off by rescue crews, said Jackie Mayo, a spokeswoman at Cleveland Hopkins International Airport.

He was wheeled into an emergency room at MetroHealth on a stretcher and later was up and walking around, said Mary Atkins, who had taken her daughter to the hospital for medical treatment and saw Carter from a nearby room.

"He walked by the room and he was saying he was ready to go," she said. "They had Secret Service everywhere."