Six Flags font here refers to the font used in the logo of Six Flags, which is an amusement park corporation founded in 1961.
The logotype of the corporation was probably designed based on ITC Kabel Bold designed by Rudolf Koch. The font is a commercial one and you can purchase and download it here.
Download Kabel Font
The Kabel font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.