Man says it’s ‘extremely possible’ his father was behind America’s only unsolved plane hijacking

More than five decades after a man calling himself Dan Cooper vanished into the night, a new theory has revived one of America’s most enduring mysteries. An inventor and pilot argues the hijacker was driven not by greed but grief, pointing to a retired Army major whose personal tragedy, forensic links and family testimony align with long-standing clues, a claim disputed by other investigators, and still unresolved.