As well as the original Parachute Jump at the 1939 World's Fair, there have been several other fairground rides based on a similar premise. The Pair-O-Chutes ride operated at Chicago's Riverview Park but was demolished in 1968. Parachute towers, known as "Parachute Drops" were developed by Intamin for the Six Flags theme parks. The Texas Chute Out operated at Six Flags Over Texas from 1976 to 2012; Great Gasp operated at Six Flags Over Georgia from 1976 to 2005 and Sky Chuter was at Six Flags Over Mid-America from 1978 to 1982. Sky Chuter was relocated to Six Flags Great Adventure, where it reopened in 1983 as Parachuter's Perch, and , it is still operational under the name "Parachute Training Center". Intamin also produced a "Parachute Drop" for Knott's Berry Farm in California in the late 1970s, which was named "Sky Jump". The parachute jump portion of the tower was removed but its observation tower remains in operation. Tokyo Dome City Attractions, Japan, has an Intamin parachute drop ride named Sky Flower.