CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins81% CONFIDENCEOverall confidence: 81%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Happened as dated, per the source[1]: "the first tenant to open for business in the Transamerica Pyramid was Crocker Bank, which held a ribbon cutting ceremony with Transamerica officials and an Open Day for visitors on November 27, 1972."
San Francisco's Transamerica Pyramid welcomed its first tenant after overcoming years of public opposition to its unconventional tapered design.
Calle de Juan Hurtado de Mendoza 11, 28036 Madrid, SpainSacha
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Opened in 1972 (year only, so estimated at year end), per esmadrid.com[1]. Restaurant information verified October 9, 2026.
A small Madrid dining room known for seasonal Spanish cooking and its neighborhood feel.
Knott's Berry Farm, Grand Avenue, Buena Park, Orange County, California, 90620, United StatesAcademy of Country Music
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Billboard[4] of 24 February 1973 says the Academy's awards will be held 'Feb. 26 at the John Wayne Theatre at Knotts Berry Farm'; Billboard of 10 March 1973 reports Donna Fargo's four awards at 'the eighth annual Academy of Country and Western Music at the John Wayne Theater, Knotts Berry Farm, Buena Park, Monday (26)'; BMI says the country clan gathered on February 26; Wikipedia[5] agrees. No start time is given, so the pin is the all-day date.
Donna Fargo won four major awards for "The Happiest Girl in the Whole U.S.A." and Roy Clark was named Entertainer of the Year at the eighth Academy of Country & Western Music awards on 26 February 1973 at Knott's Berry Farm.
The Cumberland, 555, Church Street, Downtown Nashville, East Nashville, Nashville, Davidson County, Middle Tennessee, Tennessee, 37219, United StatesRecording Academy
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Wikipedia[2]: 'The 15th Annual Grammy[1][4][5] Awards were held on March 3, 1973, at the Tennessee Theatre in Nashville, Tennessee'; no start time is given, so the pin is the all-day local date.
At the 15th Annual Grammy Awards on 3 March 1973 at Nashville's Tennessee Theatre, Roberta Flack won Record of the Year and Song of the Year for 'The First Time Ever I Saw Your Face', George Harrison's Concert for Bangladesh took Album of the Year and America won Best New Artist.
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins80% CONFIDENCEOverall confidence: 80%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better72%26 episodes
Start date confirmed on the title's own MyAnimeList[1] listing.
Nobita Nobi is so hapless that his 22nd century descendants are still impoverished as a result of his 20th century bumbling.
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins80% CONFIDENCEOverall confidence: 80%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Opened in April 1973 (month only, so estimated at month end), per Wikipedia. Restaurant information verified October 9, 2026.[1]
Chad and Hanna Williams pair a contemporary tasting menu with a downstairs bar.
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins78% CONFIDENCEOverall confidence: 78%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
This Day in Aviation: "3 June 1973: While maneuvering at low altitude at the Paris Air Show, the first production Tupolev Tu-144S, CCCP-77102 ... broke apart in midair and crashed into a residential area."[1]
The first production Tupolev Tu-144S, CCCP-77102, broke apart during its flying display at Le Bourget on 3 June 1973 and fell on Goussainville, killing all six crew and eight people on the ground.
The University of Chicago, 5801, South Ellis Avenue, Hyde Park, Chicago, Hyde Park Township, Cook County, Illinois, 60637, United StatesUniversity of Chicago
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins72% CONFIDENCEOverall confidence: 72%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
The paper's own front matter gives a two-month issue and no day: "The Journal of Political Economy, Vol. 81, No. 3 (May - Jun., 1973), pp. 637-654". With only an issue window, the pin takes its last day rather than its first.[1]
Fischer Black and Myron Scholes give a closed-form price for a European option in the Journal of Political Economy, in the same year the Chicago Board Options Exchange opens. The formula becomes the language of the derivatives market.
Sydney Opera House, Bennelong Point, Sydney NSW, Australia
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Happened as dated, per the source[1]: "the Sydney Opera House was officially opened by Queen Elizabeth II."
Queen Elizabeth II officially opened the Sydney Opera House, capping fourteen years of construction that ran a decade late and far over its original budget.
Roy E. Disney - Feature Animation Building, Riverside Drive, Burbank, Los Angeles County, California, 91521, United StatesWalt Disney Animation Studios
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins81% CONFIDENCEOverall confidence: 81%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Wikipedia's[2][3] article for the film and its list of Walt Disney Animation Studios films give the US release as 8 November 1973. The Numbers[4] lists domestic release(s): November 8th, 1973 (Wide) by Walt Disney.
Robin Hood is a 1973 American animated musical adventure comedy film produced by Walt Disney Productions and released by Buena Vista Distribution. It reached US theaters on 8 November 1973.
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better83%
Released theatrically on December 26, 1973 per the film's Wikipedia[1] infobox.
The Exorcist is a 1973 American supernatural horror film directed by William Friedkin and produced by William Peter Blatty, who adapted his own 1971 novel. The film stars Ellen Burstyn, Max von Sydow, Jason Miller, and Linda Blair, and follows the demonic possession of a young girl and the attempt to rescue her through an exorcism by two Catholic priests.
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins84% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
MICHELIN[1] Guide: "Now in its third generation after opening in 1973". Year-only, so estimated.
Third-generation Seocho samgyetang shop (opened 1973) known for a 40-ingredient broth topped with mung bean and pine nut purees.
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins91% CONFIDENCEOverall confidence: 91%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Happened as dated, per the source[1]: "The facility was established in 1974, following a series of destructive typhoons."
Japan's National Research Institute for Earth Science and Disaster Resilience completed its hangar-sized Large-Scale Rainfall Simulator in Tsukuba, letting scientists recreate extreme storms on demand to study landslides and flooding.
Hollywood Palladium, 6215, West Sunset Boulevard, Hollywood, Los Angeles, Los Angeles County, California, 90028, United StatesRecording Academy
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins85% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Grammy.com[1][2]'s Hall of Fame history says the inaugural class 'was announced on the 16th Annual GRAMMY Awards telecast on March 2, 1974'; no start time is given, so the pin is the all-day date.
On the 16th Grammy Awards telecast on 2 March 1974 the Recording Academy named the first five recordings in the new Grammy Hall of Fame, from Louis Armstrong's "West End Blues" to Bing Crosby's "White Christmas".
Hollywood Palladium, 6215, West Sunset Boulevard, Hollywood, Los Angeles, Los Angeles County, California, 90028, United StatesRecording Academy
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins76% CONFIDENCEOverall confidence: 76%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Wikipedia[2][3]: 'The 16th Annual Grammy[1] Awards were held March 2, 1974, and were broadcast live on American television' with the Hollywood Palladium in Los Angeles as location; no start time is given, so the pin is the all-day local date.
At the 16th Annual Grammy Awards on 2 March 1974 at the Hollywood Palladium, Roberta Flack won Record and Song of the Year for 'Killing Me Softly with His Song', Stevie Wonder's Innervisions won Album of the Year and Bette Midler won Best New Artist.
Aéroport de Toulouse-Blagnac, Rue Jean Cocteau, Font-Grasse, Grand-Noble, Blagnac, Toulouse, Haute-Garonne, Occitania, Metropolitan France, 31700, FranceAirbus
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
EASA type-certificate data sheet A.172 lists 'Initial Certification Date: A300 B2-1A: 15 March 1974'; Wikipedia[2] says certificates were granted by German and French authorities that day.
The Airbus A300B2-1A received its initial type certificate on 15 March 1974, clearing Airbus's first production wide-body for airline service two months before its first delivery.
Knott's Berry Farm, Grand Avenue, Buena Park, Orange County, California, 90620, United StatesAcademy of Country Music
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Billboard[4] of 9 March 1974 says the Academy of Country Music Awards show 'March 28 on ABC-TV. Show tapes at Knott's Berry Farm March 25. Roger Miller hosts'; Billboard Music Week of March 1974 says the ninth annual awards show was set for network telecast over ABC-TV March 28 at 11:30 p.m.; Wikipedia[5] gives March 25, 1974. The pin is the ceremony (taping) day, 25 March; the broadcast followed on 28 March. A newspaper dated 24 March 1974 cited by Wikipedia precedes this date, presumably an announcement of the winners.
Charlie Rich won four awards for "Behind Closed Doors" and Roy Clark became the first repeat Entertainer of the Year at the ninth Academy of Country Music awards, taped on 25 March 1974 at Knott's Berry Farm and aired on ABC on 28 March, hosted by Roger Miller.
Aéroport de Toulouse-Blagnac, Rue Jean Cocteau, Font-Grasse, Grand-Noble, Blagnac, Toulouse, Haute-Garonne, Occitania, Metropolitan France, 31700, FranceAirbus
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins79% CONFIDENCEOverall confidence: 79%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
World Airline News's[1] photo caption states 'The A300 was delivered to Air France on May 10, 1974' (msn 005, F-BVGA) next to Airbus's[6] own statement on the entry-into-service anniversary.
Air France took delivery of the first production Airbus A300B2, msn 005 registered F-BVGA, on 10 May 1974, thirteen days before the type entered scheduled service.
Heathrow Airport, Bath Road, Harmondsworth, London Borough of Hillingdon, Greater London, England, UB7 0EH, United KingdomAirbus
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins81% CONFIDENCEOverall confidence: 81%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Airline Ratings[1] says 'On May 23, 1974, Air France premiered the huge airliner on its trunk route from Paris to London-Heathrow and back'; Wikipedia[2] gives the same date.
On 23 May 1974 Air France began scheduled A300 operations, premiering the first twin-engine wide-body airliner on its Paris to London Heathrow trunk route with two round trips.
Browns Ferry Nuclear Plant, Athens, Alabama, United States
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins95% CONFIDENCEOverall confidence: 95%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Three Mile Island, 2625 River Road, Londonderry Township, Pennsylvania, United States
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins95% CONFIDENCEOverall confidence: 95%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The cited source explicitly dates this event; the pin records the stated calendar day.[1]
Unit 1 begins commercial operation on Three Mile Island in Pennsylvania, following construction that began in 1968.
Calle de la Cava Baja 35, 28005 Madrid, SpainCasa Lucio
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Opened in 1974 (year only, so estimated at year end), per Wikipedia. Restaurant information verified October 9, 2026.[1]
A traditional Castilian restaurant on Cava Baja, known for its huevos rotos.
Manor Bakeries, Fish Dam Lane, Carlton, Barnsley, South Yorkshire S71 3HQ, United KingdomMr Kipling
ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins53% CONFIDENCEOverall confidence: 53%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
The Barnsley Chronicle[3] and Yorkshire Post[2] date the start of cake manufacturing at the Lyons Bakery (later Manor Bakeries/Mr Kipling) Carlton plant to 1975, without a more precise day recorded.
Lyons Bakery's purpose-built plant in Carlton, South Yorkshire opens as the largest bakery in Europe, and starts baking what becomes the Mr Kipling cake range under later owner Manor Bakeries.
Duane Arnold Energy Center, Palo, Linn County, Iowa, United States
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins95% CONFIDENCEOverall confidence: 95%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Earl Carroll Theatre Building, 6230, West Sunset Boulevard, Hollywood, Los Angeles, Los Angeles County, California, 90028, United StatesAcademy of Country Music
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins84% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Billboard[3] of 8 February 1975 says Roger Miller will host the tenth annual awards 'in Los Angeles on Feb. 27', to be 'filmed at the Aquarius Theater' and aired on ABC's Wide World of Entertainment March 5; Billboard of 8 March 1975 reports the awards 'presented here Thursday (27) at the Aquarius Theater'; TV Guide for Wednesday 5 March 1975 lists 'The Academy of Country Music Awards' on Wide World Special. Wikipedia's[4] 5 March 1975 date and Knott's Berry Farm venue are the broadcast date and a wrong venue. No start time is given, so the pin is the all-day date of the ceremony.
Mac Davis won Entertainer of the Year, John Denver's "Back Home Again" took Album of the Year and Cal Smith's "Country Bumpkin" Single and Song of the Year at the tenth Academy of Country Music awards on 27 February 1975 at the Aquarius Theater in Hollywood, hosted by Roger Miller and aired on ABC on 5 March.
Gershwin Theatre, 222, West 51st Street, Theater District, Manhattan Community Board 5, Manhattan, New York County, New York, 10019, United StatesRecording Academy
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins80% CONFIDENCEOverall confidence: 80%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The Beatles Bible[2]: 'John Lennon and Yoko Ono attended the 17th Annual Grammy[1] Awards ceremony on 1 March 1975... before the ceremony began at the Uris Theatre on Broadway'; Wikipedia[3]: 'presented March 1, 1975'. No start time is given, so the pin is the all-day local date.
At the 17th Annual Grammy Awards on 1 March 1975 at New York's Uris Theatre, Stevie Wonder won four awards including Album of the Year, Olivia Newton-John won Record of the Year for 'I Honestly Love You' and Marvin Hamlisch won Song of the Year and Best New Artist.
17 Market Lane, Chinatown, Melbourne, Victoria 3000, AustraliaFlower Drum
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins83% CONFIDENCEOverall confidence: 83%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Wikipedia[1] states the day: "The Flower Drum[2][3] was established by Gilbert Lau and opened on 26 May 1975", and its infobox carries the same date.
Gilbert Lau opened Flower Drum on 26 May 1975 in Melbourne's Chinatown and spent the following decades making the case that Cantonese cooking belonged at the top of Australian fine dining rather than in a separate category of it. It has been a fixture of the city's restaurant lists ever since, on Market Lane.
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins90% CONFIDENCEOverall confidence: 90%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Opened on May 26, 1975, the date on Chronopin's Flower Drum[1] opening pin. Restaurant information verified October 9, 2026.
A fine-dining Cantonese restaurant in Melbourne’s Chinatown, known for refined food and attentive service.
Suez Canal Authority, شارع الجمهوريه, الدائرة الجمركية, سيريا, بورسعيد, 42529, مصرSuez Canal Authority
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins82% CONFIDENCEOverall confidence: 82%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The Suez Canal[2] Authority's history page, Wikipedia[1][3] (Suez Canal and its closure article, which captions the ceremony 5 June 1975) and The Gamming[4] all give 5 June 1975.
President Anwar Sadat reopened the Suez Canal on 5 June 1975, eight years after the Six-Day War closed it. A mine-clearing effort by the US and Britain through 1974 had cleared the waterway.
Boeing Everett Assembly Plant, Airport Road, Everett, Snohomish County, Washington, 98204, United StatesBoeing Commercial Airplanes
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins78% CONFIDENCEOverall confidence: 78%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Yesterday's Airlines: "The SP first flew on July 4, 1975"; Boeing Classics titles its archive film "First Flight of the Boeing 747SP, July 4, 1975".[1]
The shortened, long-range Boeing 747SP flew for the first time on 4 July 1975. Built for Pan Am's New York-Middle East routes, it entered service with Pan Am on 25 April 1976.