Question: This cruise ship, laid down on December 2008 is 50mm longer than a cruise ship laid down on what date?

Context articles: MS Costa Allegra
MV Kungsholm (1965)
Cruise ship ID card
MS Allure of the Seas
MS Oasis of the Seas
Celestyal Crystal
MV Ola Esmeralda (1966)
MV Seabourn Odyssey
RMS Ivernia
Club Harmony

Costa Allegra, formerly "Annie Johnson", was a cruise ship owned by the Italy-based Costa Cruises, one of many subsidiaries owned by Costa's parent company Carnival Corporation.
 She was built in 1969 by the Wärtsilä Turku Shipyard in Turku, Finland, as a container ship for the Johnson Line services of Sweden-based Rederi AB Nordstjernan.
 In 1986 she was sold to Regency Cruises with the intention of being converted into a cruise ship as "Regent Moon", but she was laid up instead.
 In 1988 she was sold to Compania Naviera Panalexandra and renamed "Alexandra" but continued laid up.
 In 1990, the ship was acquired by Costa Cruises and rebuilt into a cruise ship at the T. Mariotti shipyard in Genoa, Italy.
 She entered service as "Costa Allegra" in 1992.
MV Kungsholm was built in 1966 by the John Brown & Company shipyard in Clydebank, Scotland as a combined ocean liner / cruise ship for the Swedish American Line.
 She was later rebuilt as a full-time cruise ship.
 She also sailed under the names MV "Sea Princess, MV "Victoria, MV Oceanic II.
 and MV Mona Lisa as a cruise ship owned by Leonardo Shipping and operated under charter by Lord Nelson Seereisen .
In September 2010 she was retired from service as she did not fulfill requirements to SOLAS 2010 and her charter with Lord Nelson Seereisen had ended.
 She was bought by the Korean Daewoo company and moved to Duqm, Oman, where she operated under the name Veronica as floating hotel until October 2013.
 She was then laid up for two years until sold to ship breakers in Alang, India in late 2015.
 Scrapping took place the following year in May, 2016.
A cruise ship ID card is a plastic card the size of a credit card that serves several functions for passengers on a cruise ship.
 Cruise ship ID cards are scanned at the entrances to the ship and at various points throughout the ship, either via magnetic strip, RFID readers or bar code in order to identify the passenger, allow entry to and exit off the ship, allow entry into certain areas of the ship, including the passenger's cabin, bill purchases to the passenger, and various other functions.
MS "Allure of the Seas" is an "Oasis"-class cruise ship owned and operated by Royal Caribbean International.
 s of 2016 the "Oasis" class were the largest passenger ships ever in service, and "Allure" is 50 mm longer than her sister ship "Oasis of the Seas" , though both were built to the same specifications.
 Designed under the name "Project Genesis", she was ordered from Aker Finnyards in February 2006 and her construction began at the Perno shipyard, Turku, Finland, in February 2008.
 She was named in May 2008 after a contest was held to name her and her sister.
 The keel of "Allure of the Seas" was laid on 2 December 2008, shortly after the shipyard had been acquired by STX Europe.
MS "Oasis of the Seas" is an "Oasis"-class cruise ship owned by Royal Caribbean International.
 Her hull was laid down in November 2007 and she was completed and delivered to Royal Caribbean in October 2009.
 At the time of construction, "Oasis of the Seas" set a new capacity record of carrying over 6,000 passengers.
 The first of her class, she was joined by sister ships  in December 2010 and  in May 2016.
 "Oasis of the Seas" conducts cruises of the Caribbean from her home port of Port Canaveral in Cape Canaveral, Florida.
Celestyal Crystal, previously Louis Cristal, is a cruise ship operated by the Cyprus-based Celestyal Cruises and previously Louis Cruise Lines, both in the Louis Group.
 The ship was originally built as the cruiseferry MS "Viking Saga in 1980 at Wärtsilä Turku New Shipyard, Turku, Finland for Rederi Ab Sally.
 In 1986 she was renamed MS "Sally Albatross, and rebuilt into a cruise ship the following year.
 The ship was destroyed by a fire in 1990, and completely rebuilt at Finnyards, Rauma, Finland.
 She was re-delivered in 1992, still named "Sally Albatross".
 After partially sinking 1994 she was rebuilt at Industrie Navali Maccaniche Affini, La Spezia, Italy, re-entering service as MS "Leeward for Norwegian Cruise Line.
 Subsequently she sailed as MS "SuperStar Taurus for Star Cruises, MS "Silja Opera for Silja Line and spent a year laid up as MS "Opera prior to entering service with her current owner in 2007.
Ola Esmeralda was a cruise ship, owned and operated by Fred.
 Olsen Cruise Lines.
 She was built in 1966 by the Lübecker Flender-Werke in Lübeck, West Germany for Fred.
 Olsen Lines for combined ferry/cruise ship operations.
 From 1970 until 1983 she sailed the northern hemisphere summer seasons on ferry service for Det Bergenske Dampskibsselskab as Venus, while returning to cruise service with Fred.
 Olsen for the winter seasons.
 In 1983 the summer ferry service was taken over by DFDS, and in 1985 it passed to Norway Line.
 In 1986 Fred.
 Olsen bought the ship outright and she was converted to a full-time cruise ship, retaining the name "Black Prince".
The Seabourn Odyssey is a cruise ship for Seabourn Cruise Line.
 The ship's keel was laid in early July 2007, and when it was commissioned in 2009, it was the first new ship for Seabourn in over a decade.
 The ship includes 11 decks with two swimming pools, six outdoor whirlpools, water sports from the marina and a private diamond showroom.
 About 90% of the ship's suites have private verandas.
 Some of the "Seabourn Odyssey"'s features include one of the largest spas featured in a cruise ship, a built-in marina, and expanded guest services compared to the older Seabourn fleet.
 The Retreat features a nine-hole mini golf course, a giant chess board and shuffleboard.
 The ship was completed in May 2009, a few weeks earlier than planned.
 A sister ship, Seabourn Sojourn, was launched in 2010.
 was a "Saxonia" class ocean liner, built in 1955 by John Brown & Company in Clydebank, Scotland for Cunard Line, for their transatlantic passenger service between the UK and Canada.
 In 1963 she was rebuilt as a cruise ship and renamed RMS "Franconia, after the famous pre-war liner RMS "Franconia".
 She continued to sail for Cunard until being withdrawn from service and laid up in 1971.
 In 1973 she was sold to the Soviet Union's Far Eastern Shipping Company and, renamed SS "Fedor Shalyapin, cruised around Australia and the far East.
 In 1980 she was transferred to the Black Sea Shipping Company fleet, and for a time returned to cruising in the Mediterranean and around Europe.
 In 1989 she was transferred again, to the Odessa Cruise Company, and continued her career as a cruise ship until 1994.
 She was then laid up at Ilichevsk, a Black Sea port 40 km southwest of Odessa, until 2004 when, as the Salona, she sailed to Alang, India, where she was scrapped.
Club Harmony was a cruise ship, last owned by Polaris Shipping and operated by Harmony Cruises.
 She was built in 1969 by the Wärtsilä Turku Shipyard in Turku, Finland as the container ship "Axel Johnson" for the Sweden-based Rederi AB Nordstjernan and operated on their Johnson Line services.
 In 1986 she was sold to Regency Cruises with the intention of being converted into a cruise ship under the name "Regent Sun", but she was laid up instead.
 In 1987 she was sold to and renamed "Italia" but continued laid up.
 In 1988 the ship was acquired by Costa Cruises, renamed "Costa Marina" and rebuilt into a cruise ship at the T. Mariotti shipyard in Genoa, Italy.
 She entered service as the "Costa Marina" in 1990.
 After a refurbishment in 2002, she was marketed more towards German passengers.
 She was designed to blend together the outdoors with elegant Italian art.