As the plane flew over Washington state, Cooper asked to be left alone. At around 8.00 p.m., a warning sing in the cockpit indicated that one of the aircraft’s doors had been opened. A flight attendant checked the plane and discovered that Cooper was missing. He had taken the money and of the parachutes and jumped 3 kilometers into the forest below. Police searched the forest for five months, but they never found Dan Cooper or the money. Was Dan Cooper’s real name Duane Weber? The police cannot be sure. Perhaps only Duane Waber knew the truth.