Question: When did six flags begin commercials for linking all of the parks?
About the article "Six Flags", section "TV Commercials".

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In 2004, Six Flags began a series of commercials linking all of the parks.
The commercials were notable for a new mascot, "Mr. Six", an apparently feeble old man in a tuxedo and red bow tie.
In many of the commercials, Mr. Six would slowly exit a multi-colored bus, only to start frenetically dancing to the Vengaboys' "We Like to Party".
The commercials were an immediate hit and Mr. Six almost instantly became the official mascot, although he was initially retired after the 2005 season.
These ads have become widely parodied on the Internet, with faces from other Internet memes being superimposed over Mr. Six's face.
From 2008 to 2010, Six Flags' TV ads have a "Fun-O-Meter" in which the beginning of the ad may show something boring or embarrassing and a man's face judges it "One Flag!"
or sometimes "Two Flags!"
Then roller coasters and attractions of Six Flags are shown and says "Six Flags, More Flags, More Fun!"
for Six Flags parks.
However, the thick accent of the Asian man in the original commercials had drawn criticism for being an offensive caricature.
In 2009, the Mr. Six character came back from retirement and replaced the Asian man in Six Flags' ads, still using the Fun-O-Meter.
Since 2011, Six Flags' TV ads got a brand-new slogan "Go Big!
Go Six Flags!"
for its current Six Flags theme parks.
Frontier City was opened in 1958 as a Western "town" theme-park.
It opened up at the Oklahoma State Fairgrounds, but moved to its current location a few years later to become a "boom town," since it sprung-up quickly.
The park added spinning rides, several roller coasters and a log flume ride starting in the 1960s and 1970s.
Rather than a traditional ribbon cutting, Frontier City was scheduled to have an old fashioned six shooter aimed at a piece of rope stretched across the stockade entrance.
The rope stretched across main street is still used today for the opening of the park.
Frontier City was originally owned and operated by Premier Parks.
It was the company's first and flagship park.
Premier Parks' corporate offices were located at the southeast corner of the Frontier City property until 2006 when the company's offices were moved to New York.
Premier Parks purchased Six Flags Inc. in 1998.
It was thought that Frontier City, Wild Waves/Enchanted Village, and Great Escape would eventually be re-branded as Six Flags parks, but they never were.
The other two parks sold Six Flags season passes good at all Six Flags parks except for Frontier City and White Water Bay.
The Frontier City passes were only good there and not at other Six Flags parks.
But in some years, Six Flags passes were also available for purchase at a higher price.
Six Flags corporate offices remained in Oklahoma City, but left in 2006, despite Oklahoma City's now booming economy.
On January 27, 2006, Six Flags put Frontier City and White Water Bay, Six Flags Magic Mountain, Elitch Gardens, Darien Lake, a couple of waterparks, and Wild Waves/Enchanted Village for sale.
At the same time, Six Flags also announced its plan to close corporate offices in Oklahoma City and move to New York City.
Six Flags CEO Mark Shapiro had said he expected the parks to continue operation after the sale.
But rumors surfaced that some of them could close.
On January 11, 2007, Six Flags opted to keep Magic Mountain, but then announced that it would sell Frontier City and White Water Bay, along with Elitch Gardens, Darien Lake, Splashtown (near Houston), and Wild Waves/Enchanted Village to PARC 7F-Operations.
[http://www.sixflags.com/parks/frontiercity/parkpress/saleannouncement.html] As a part of the deal, the "Six Flags" prefix was removed from the names of Elitch Gardens and Darien Lake.
Frontier City and White Water Bay were never branded as Six Flags parks.
Since the management was changed from Six Flags to PARC Management, Frontier City has been granted the largest capital investment that the park has seen in its 50 years.
The new ownership allowed for the addition of the Steel Lasso, as well as a few minor changes within the park.
On November 24, 2010, CNL announced that it had reached an agreement to terminate PARC's lease of Elitch Gardens and up to 17 other locations.
The move came after, according to their 2010 SEC filings, PARC defaulted on their lease obligations on the properties.
Five of the original six parks originally purchased from Six Flags are also involved in the lease termination.CNL Lifestyle Properties, Inc., owners of "Frontier City"; Frontier City theme park and White Water Bay water park again will be getting the Six Flags management touch when former Six Flags executives Kieran Burke and Gary Story begin managing the properties as Premier Parks, LLC. 
In March 1999, Premier Parks, the holding company for all the Six Flags theme parks, announced the purchase of Reino Aventura for an estimated $59 million.
The park then underwent a major reconstruction, which cost approximately $40 million and was reopened to the public on April 14, 2000 as Six Flags México. 
Six Flags New England (SFNE), formerly Riverside Amusement Park, is a Six Flags theme park, named for the New England region, in which it is located.
Located off of Massachusetts State Route 159, Six Flags New England is located less than from the major City of Springfield, Massachusetts, in the nearby town of Agawam, Massachusetts.
Six Flags New England is less than a mile from the Connecticut border, making it very popular with Connecticut residents as well as Massachusetts residents.
Like most Six Flags parks, Six Flags New England consists of a theme park and a water park.
Although it did not originally open as such, it is the oldest of the Six Flags parks. 
Initially, Six Flags parks would prepare separate marketing campaigns for each park, sometimes with special themes (like the 25th anniversary of Six Flags Great America and the 35th anniversary of Six Flags Over Georgia in 2002).