Question: When did the hijacking take place that was the source for the fortune being sought by the three friends in the film Without a Paddle? 

Context articles: Braathens SAFE Flight 139
Aniversario: Never Compromise
Game of the Three Friends
Three Friends of Winter
Sunday (1969 film)
Threesome (TV series)
Battle for the Paddle
Manevri na petiya etazh
Without a Paddle
D. B. Cooper

Braathen SAFE Flight 139 was an aircraft hijacking that occurred in Norway on 21 June 1985.
 The incident took place on a Boeing 737-205 belonging to Braathens SAFE that was on a scheduled flight from Trondheim Airport, Værnes to Oslo Airport, Fornebu.
 The hijacker was Stein Arvid Huseby, who was drunk during most of the incident.
 It was the first plane hijacking to take place in Norway; there were no deaths and no injuries.
 Huseby was sentenced to three years prison and five years detention.
Aniversario: Never Compromise was a professional wrestling internet pay-per-view (iPPV) event produced by the Chikara promotion, that took place on June 2, 2013, at the Trocadero Theatre in Philadelphia, Pennsylvania.
 The event marked Chikara's fourth iPPV, third to take place at the Trocadero Theatre and the promotion's only event to take place in Philadelphia in 2013.
 Much like the previous iPPV, Under the Hood, Aniversario: Never Compromise also aired through Smart Mark Video.
 Aniversario: Never Compromise celebrated Chikara's eleventh anniversary and was the first anniversary event to take place on iPPV; in the past, the promotion had celebrated its anniversaries with weekends of two shows.
 The event saw all three Chikara championships being defended with one title change, where Pieces of Hate (Jigsaw and The Shard) defeated 3.0 (Scott Parker and Shane Matthews) for the Campeonatos de Parejas.
 Another major match during the event saw former Campeones de Parejas, Amasis and Ophidian, end their nineteen-month storyline rivalry in a Sarcophagus match.
 The event concluded with a major storyline development, where Chikara's authority figure Wink Vavasseur ended the event and shut down the promotion, while the main event was still going on in the ring, leading to the promotion going inactive for a full year.
Game of the Three Friends (Chinese: 三友棋 , "Sān-yǒu-qí" ; also called Sanyou Qi or Three Friends Chess) is a three-player variant of the game xiangqi ("Chinese chess").
 It was invented by Zheng Jinde (Chinese: 鄭晉德 , "Zhèng Jìndé") during the Qing Dynasty (1661–1722 AD).
The Three Friends of Winter, also known as Suihan Sanyou (or "shochikubai"), symbolize the pine, bamboo, and plum.
 The Chinese observed that the pine, bamboo and plum do not wither as the cold days deepen into the winter season unlike many other plants.
 Known by them as the "Three Friends of Winter", they entered the conventions of East Asian culture.
 Together they symbolize steadfastness, perseverance, and resilience.
 They are highly regarded in Confucianism and as such represent the scholar-gentleman's ideal.
Sunday () is the debut feature film of Croatian film director Lordan Zafranović, premiering in 1969.
 Zafranović made a film while he was still a student.
 The plot follows a Sunday in life of a young man who wanders along streets of Split along with three friends, entering a range of bizarre situations, culminating in hijacking of a bus and standoff with police.
Threesome (stylised as threesome) is a British television sitcom written by Tom MacRae and starring Stephen Wight, Amy Huberman and Emun Elliott.
 The series is focused around three friends—Alice, Mitch and Richie—who return home from a night out celebrating Alice's birthday and end up having a threesome, which results in Richie getting Alice pregnant.
 Instead of getting an abortion, the three friends decide to raise the baby as a trio.
 The series began airing on 17 October 2011 on Comedy Central and Comedy Central HD.
 It is the first original scripted comedy commissioned by Comedy Central and is produced by Big Talk Productions.
The Battle for the Paddle is the result of a game postponement.
 In fall 1998, the Nicholls State Colonels were scheduled to take on the Texas State Bobcats.
 Prior to the game, heavy rains flooded San Marcos, Texas and the field at Texas State.
 Athletic directors and coaches from both schools decided to postpone the game and coined the annual contest the "Battle for the Paddle," joking that fans and athletes needed to use a boat and paddle to get to the game.
 The game eventually took place on November 28, 1998 with Texas State prevailing 28–27 to win the Paddle Trophy.
Three colleagues and devoted friends – Danton, Petar and Andrey – share an office and not only on the fifth floor of a socialist industrial research institute from the mid-eighties.
 Every morning when they come to work they lock the door of the office and, armed with binoculars and great interest, they begin watching the aerobics exercises of a young girl in the nearby building.
 Suddenly, their tranquil daily round is disturbed - a new director takes over the Institute and decides to develop close scientific partnerships with similar institutes in Japan.
 A rumor has it that one of our three friends will go on a business trip there.
 But who?
 The three friends are now rivals.
 "Homo homini lupus est"!
 All the three undertake sophisticated underground maneuvers in order to get the prize.
 Everything is at stake!
 There is only one rule and it is there are NO rules!
 At the end, of course, it turns out everything has been in vain.
 The one to go to Japan is the director.
<br>Numerous situations filled with humor follow and, at the very end, after the grotesque outcome, we can see the three friends together again.
 But this time, much wiser… perhaps.
Without a Paddle is a 2004 American comedy film directed by Steven Brill, written by Jay Leggett and Mitch Rouse, and based on a story by Harris Goldberg, Tom Nursall, and Fred Wolf.
 The film stars Seth Green, Matthew Lillard, Dax Shepard, Ethan Suplee, and Burt Reynolds.
 It tells the story of three reunited childhood friends going on a trip up a remote river in order to search for the loot of long-lost airplane hijacker D. B. Cooper.
D. B. Cooper is a media epithet popularly used to refer to the hijacker of a Boeing 727 aircraft in Washington, on November 24, 1971.
 Utilizing knowledge that was virtually unique to the CIA, he escaped by parachute with over a million dollars at current values.
 Because he failed to obtain protective equipment for a descent in extreme conditions, law enforcement incline to the view that Cooper was too inexperienced for such a challenging free-fall jump and was killed.