Question: how many guests did Six Flags host in 2009?
About the article "Six Flags", section "Abstract".

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Host Park: Six Flags Fiesta Texas 
WaterWorld, Houston's first major water park, was constructed on a section of land east of AstroWorld and opened to the public in 1983.
Admission to the water park was separate for almost 20 years, until it was decided in 2002 to allow admission to both parks with one paid ticket, at which time the entire water park became a themed area of AstroWorld.
The park was originally accessible only via the Six Flags Astroworld narrow gauge "610 Limited" locomotive, but a pedestrian sidewalk was eventually built, allowing guests to walk from the Six Flags Waterworld ticketing area to the park itself, eliminating the need to wait for a train ride.
Six Flags Waterworld became a themed section of Six Flags Astroworld in 2002 with a second entrance being built near the "Plaza De Fiesta" section of Six Flags Astroworld; a single ticket granted admission to both parks.
Original attractions included Breaker Beach (large wave pool), Squirt Splash (children's play area), speed slides, body slides, lagoon activity area, and an inner-tube chute that wound itself around and over the "Thunder River" rapids ride.
Many items from Six Flags Waterworld were moved to Six Flags Splashtown after the closure and demolition of Six Flags Astroworld. 
Shipwreck Falls is a Shoot-the-Chute water ride at many Herschend and Six Flags theme parks, in the United States.
The attraction is themed to sharks and shipwrecks, and all feature an exit bridge over the ride so guests can get wet while exiting. 
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.
During the park's branding as a Six Flags in 2000, the Looney Tunes characters were added to the park.
The line-up of Looney Tunes characters includes: Bugs Bunny, Daffy Duck, Tweety Bird, Sylvester, Foghorn Leghorn, Porky Pig, Petunia Pig, Pepe Le Pew, Roadrunner, Wile E. Coyote, Marvin the Martian, Taz, Granny, Lola Bunny, Elmer Fudd, Speedy Gonzales, Yosemite Sam, and Gossamer.
In 2006, the park underwent a massive expansion in the entertainment department when Mark Shapiro took control of Six Flags.
With this, Six Flags New England has added "Justice League" characters, along with the Hall of Justice.
In 2007, enemies of the Justice League known as the Legion of Doom came to Six Flags.
This addition brought the following characters to the park: Batman, Robin, Aquaman, Wonder Woman, Hawk Girl, Green Lantern, The Flash, The Joker, The Riddler, Sinestro, Cheetah, Lex Luthor, and Captain Cold.
The Hall of Justice was were the Jokers Wild Card flat ride used to be, which was transformed into a secret lair.
Times are posted outside indicating when guests will be able to meet the characters and pose for pictures.
The park also has some of the characters from Mystery Inc including the great dane detective himself Scooby Doo, his best friend Shaggy Rogers, and his nephew Scrappy Doo.
Six, the chain's mascot, roams around the park dancing and interacting with park guests.
When We Like to Party comes over the loudspeakers he breaks out in his signature dance.
In the 2008 season, the Glow in the Park Parade was introduced.
It is the unique brainchild of world-renowned creative director Gary Goddard and features five custom-designed floats, 65 performers and over 35 support staff members and technicians.
Each float is adorned with vibrant-multicolor lights that illuminate the park and surround the streets with custom-composed cirque-inspired music.
The parade features drummers, puppeteers, singers, dancers, and kinetic stilt walkers to create an unparalleled nighttime spectacular.
The parade did not return in the 2009 season, but it did return in 2010.
The parade never got to complete its full season run in 2010.
It was cancelled in July after new management took over the Six Flags Corporate office.
In 2009, the park created their own original characters that pick up trash.
They are coined the "Mop Squad."
They are a group of improv artists who clean, throw dance parties, and play games with guests.