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D.B. Cooper: D.B. Cooper was a famous and mystical criminal in American history. He identified himself as Dan Cooper. On November 24, 1971, he flew from Portland, Oregon to Seattle, Washington at 2:50 p.m. PST (Pacific Standard Time). During the flight, he gave a note to an air hostess Florence Schaffner claiming he had a bomb at 3:00 p.m. PST, he demanded $200,000 in cash, four parachutes, and a fuel truck ready at the airport in Seattle. He hijacked Northwest Orient Airlines Flight 305, Boeing 727. To fulfill his demand the plane landed at Seattle-Tacoma International Airport at 5:39 p.m. PST and the crew received cash from the airport all $20 bills, he allowed 36 passengers and a few crew members to get out of the plane at Tacoma International Airport. The $200,000 cash in $20 bills was from Seattle First National Bank. Tina Mucklow played a significant role in that incident she sat next to Cooper and followed his instructions and relayed his demands to the cockpit after the plane took off from Seattle at 7:40 p.m. PST. After receiving what he demanded, he instructed the pilots to fly toward Mexico at an altitude of 10,000 feet about 3048 meters, and a speed of 170 knots about 315 km/h or 196 mph. He jumped off the plane at 8:13 p.m. PST, the crew felt some pressure change in the cabin indicating that Cooper jumped off the plane, the pressure changed due to the open cabin. He jumped out of the plane over southwestern Washington. FBI recorded the serial numbers of the $20 bills and spread them nationwide in all the banks, no one could use the $20 bill with those serial numbers all across the U.S. of America. FBI conducted an extensive investigation known as NORJAK (Northwest Highjacking) and a lot of water research by guessing the areas in which might he land they took help from the Air Force for guessing. FBI searched the foot and the air of all the land area and the water areas like lakes and rivers in that area, they guessed that he might have landed in that area, but no conclusive clue was found related to the crime. FBI also investigated forensic shreds of evidence on the plane, FBI collected approximately 66 latent fingerprints from the plane. The FBI also found a titanium tie clip of him which indicated that he might have worked in the manufacturing factory or industry in which titanium is used. They made psychological and profile analyses based on witness accounts, the FBI built a psychological profile, describing Cooper as likely a knowledgeable, possibly military-trained man who was familiar with aviation and skydiving basics. FBI investigated over 800 suspects Richard Floyd McCoy, Kenneth Christiansen, and Duane Weber are prominent names from them. The FBI released sketches and descriptions of Cooper, appealing to the public for leads, which led to thousands of tips but no resolution. After 9 years on 10 February 1980 an eight-year-old boy named Brian Ingram found $5800 decomposed $20 bills with matching serial numbers on the banks of the Columbia River near Tena Bar, Washington. Some pieces of parachutes were also found there. Dan Cooper got the title of D.B Cooper because of the paper editor's mistake, the editor typed D.B Cooper instead of Dan Cooper. Anyways the case is still unsolved, and the FBI officially declared the closure of this case on July 08 2016 after 45 years of investigation. This is how it became one of the most inexplicable cases worldwide and D.B. Cooper became one of the most cryptic personalities. He was in his forties when he committed hijacking.

Brian Ingram later sold the D.B Cooper ransom money of $5,800 at an auction held by Spink (an auction house), the ransom was sold for $37,000 to a private buyer, on 22 October 2008 when Brian Ingram was approximately 36 years old.

PST stands for Pacific Standard Time, which is used in the western United States. It is eight hours behind UTC Coordinate Universal Time (UTC-8). It is used during winter periods that are non-daylight saving, from mid-November to mid-March. PDT stands for Pacific Daylight Time and is used from mid-March to mid-November this is used in the daylight saving period, it is seven hours behind the UTC Coordinate Universal Time (UTC-7).

On the internet here are images of his tie and the note he wrote to the air hostess.

There are a lot of cases in which the investigation teams failed. In my opinion the government or investigation teams should keep limited buget for investigation because the money they are spending on investigation comes from taxes of citizens of the country, like in the case of D.B. Cooper they spent millions of dollars in total in 45 years of investigation. If they keep limited buget and limited time limit for the case to be investigated then they could save millions of dollars, that money can be spend on the betterment of the country, like on educational sector, health sector, and employment sector. The money can also be spend on homeless shelters, old age homes, orphanages, foster cares, and pet shelters. The goverment can also build libraries, laboratories, and practical houses.

The taxes money should spend on these types of projects for the betterment of citizens and country. The time for the cases should limited so that the teams save more time, energy and resources.