There is only one unsolved case of hijacking in US aviation history - that of DB Cooper. A man, actually going by the name of Dan Cooper (it was later reported incorrectly by the media) bought a one-way ticket for flight 305 between Portland International Airport and Seattle, Washington. Shortly after take-off, Cooper whispered to an air stewardess to take a note from him, and that he had a bomb. The note requested she sit next to him and that he was hijacking the place. She did as told, and with some trepidation asked to see the bomb. Cooper opened up his briefcase enough the stewardess to see eight red cylinders in two rows. He gave her his demands - $200,000, four parachutes (two main and two reserve) and a fuel truck standing by in Seattle to refuel the aircraft as soon as it landed. This was communicated to the pilot, who in turn made the authorities aware of the situation. When the plane landed in Seattle, Cooper let all of the passengers go in exchange for the money, which the FBI had quickly assembled from nearby banks. As the plane was being refuelled, Cooper discussed his intended flight plan with the cockpit crew; he made a number of requests about altitude, direction, and even the position of the aircraft’s wing flaps. He also requested that the aircraft take off with the rear staircase deployed, however the captain refused - yet Cooper said he would lower it himself once they were airborne. Eventually, the aircraft took off, Cooper politely asked the remaining flight steward to join the crew in the cockpit and close the door. He did so, and at around 8pm the pilot saw the warning sign that the rear stairs had been lowered, and he and the rest of the crew felt a change in air pressure, indicating that the rear door had been opened. Dan Cooper - or whoever he was - had parachuted out with the money. He has never been found, and no additional information about the case have ever since come to light!