A lawsuit against an Oklahoma-based company claiming it and other natural gas companies gouged two Kansas plaintiffs is headed for the U.S. Supreme Court.

The Topeka School District and Learjet are part of a lawsuit with more than a dozen other businesses and schools that say ONEOK and other natural gas companies illegally fixed prices between 2000 and 2002.

Oralarguments before the Supreme Court are scheduled for next month.

ONEOK used to own Kansas Gas Service, but the companies split in 2013. KGS and natural gas distribution companies in Oklahoma and Texas formed a new company called ONE Gas.

KGS spokeswoman Dawn Ewing says neither KGS nor ONE Gas is involved in the lawsuit.

ONEOK denies manipulating natural gas prices.

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Associated Press Information from: The Topeka-Capital Journal