Exclusive Ride Time
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Exclusive Ride Time (ERT) is time set aside by an amusement park to allow a club or group exclusive use of one or more amusement rides (usually roller coasters). ERT sessions are usually scheduled outside of park operating hours, although an amusement park may close off the ride(s) to the public during operating hours.
ERT is usually given out to roller coaster enthusiast groups (one of the most notable is American Coaster Enthusiasts), although parks will also hire out ride(s) for private functions or open a new ride for season pass-holders to try out before opening to the public. Alternatively, a club or group may hire an entire amusement park for private functions.