Question: Which date the Six Flags filed for bankruptcy protection?
About the article "Six Flags", section "Abstract".

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Six Flags Entertainment Corp. is the world's largest amusement park corporation based on number of properties, and the fifth-most popular in terms of attendance.
The company maintains 18 properties throughout North America consisting of theme parks, thrill parks, water parks, and family entertainment centers.
In 2009, Six Flags properties hosted 23.9 million guests.
The company was founded in Texas and took its name from its first property, Six Flags Over Texas.
The company maintains a corporate office in Midtown Manhattan, New York City and its headquarters are in Grand Prairie, Texas.
On June 13, 2009, the corporation filed for Chapter 11 bankruptcy protection and successfully exited the restructuring on May 3, 2010.
On June 28, 2012, Stockton filed for Chapter 9 bankruptcy.
On April 1, 2013, a federal judge accepted the bankruptcy application.
On October 4, 2013, Stockton City Council approved a bankruptcy exit plan by a six-zero vote to be filed with the U.S. Bankruptcy Court, Eastern District of California, Sacramento.
Voters approved a 3/4-cent sales tax which would help fund the bankruptcy exit on November 5, 2013. 
The company's cash flow had decreased by over 120 million dollars annually during the Shapiro years and in October 2008, Six Flags was warned its stock value had fallen below the required minimums to remain listed on the New York Stock Exchange.
With the 2008–2009 global financial crisis weighing both on consumer spending and the ability to access credit facilities, Six Flags was believed to be unable to make a payment to preferred stockholders due in August 2009.
Management saw the business as a sound one, noting that attendance across the company's parks increased slightly in 2008 compared to 2007.
Six Flags CEO Mark Shapiro said that the company's problem was the declining attendance and cash flow created by his new management initiatives .
If not resolved, the company warned in its 2008 annual report that the situation might require a Chapter 11 bankruptcy filing, with Six Flags already retaining counsel should that occur.
The company stated at the time that it expected business to continue as normal in the event of such a filing, although one analyst believed attendance at the company's parks would decrease by six percent, suggesting parents would be leery of letting their children ride a roller coaster operated by a bankrupt company.
In April 2009, the New York Stock Exchange announced it would delist Six Flags' stock on April 20, a decision that the company did not intend to appeal.
On June 1, 2009, Six Flags announced they would delay their $15 million debt payment further using a 30-day grace period.
Less than two weeks later, on June 13, the firm filed for Chapter 11 bankruptcy protection, but issued a statement that the parks would continue to operate normally while the company restructured.
On August 21, 2009, Six Flags' Chapter 11 restructuring plan was announced in which lenders would control 92% of the company in exchange for cancelling $1.13 billion in debt.
The approval of this plan is pending per the decision of the presiding U.S. Bankruptcy Judge.
One component of the restructuring was negotiating a new lease agreement with the Kentucky State Fair Board, which owned much of the land and attractions for Six Flags Kentucky Kingdom.
Six Flags had asked to forgo rent payments for the remaining nine years of its current lease agreement in exchange for profit-sharing from the park's operations.
When it appeared that the offer had been rejected, Six Flags announced in February 2010 that it would not re-open the park.
However, the Kentucky State Fair Board stated at the time that they were still open to negotiating a revised lease agreement.
On April 28, 2010, the company's bondholders reached an agreement on a reorganization plan.
Junior note holders, including hedge funds Stark Investments and Pentwater Capital Management, assumed control of the company, while senior note holders were paid in cash.
Despite objections from some parties who stood to gain nothing, the bankruptcy judge approved the plan on April 30, 2010.
As part of the settlement, Chairman of the Board Dan Snyder was removed, while Chief Executive Officer Mark Shapiro briefly remained in his post. 
On December 12, 2010, A&P filed for Chapter 11 bankruptcy protection, citing assets of $2.5 billion and debts totaling $3.2 billion.
The company would emerge from bankruptcy protection on March 13, 2012, making it, and all of its six supermarket divisions, including Pathmark, private.
On July 26, 2013, the Wall Street Journal reported that A&P is seeking to sell the company after emerging from bankruptcy in 2012. 
On December 2, 2008, Entellium filed for Chapter 11 bankruptcy protection, paving the way for some assets to be sold to financial software maker Intuit.