OMAHA, Neb. (AP) — A 91-year-old Nebraska veteran on a one-day trip to the World War II Memorial in Washington, D.C., died on the flight home just hours after the visit.

Donald Dragoo, a World War II Army vet, traveled to Washington as part of the Heartland Honor Flight, which transports veterans free of charge to the memorial and other sights.

He slumped over and became unresponsive about 20 minutes before the return flight carrying more than 100 veterans landed in Lincoln on Tuesday night, flight organizer Bill Williams said. Two doctors onboard were unable to revive him, Williams said.