CHARLOTTE — On March 28, 2015, Carowinds unveiled Fury 325, the world’s tallest and fastest giga coaster, attracting guests from around the globe to the North Carolina-South Carolina state line.

Six Flags is offering an unlimited access pass to all of its parks next year, including Carowinds, just a month after merging with Carowinds’ parent company. The all-park passport add-on means ...