Flight-tracking company FlightAware has filed a lawsuit against prediction-markets operator Kalshi, alleging the platform improperly leveraged its proprietary information and brand to support wagering on flight cancellations.

The complaint, submitted August 10, 2026, in the US District Court for the Southern District of New York (case 1:26-cv-06824), names Kalshi Inc. along with several affiliated entities. FlightAware accuses Kalshi of using its flight data and trademarks without authorization to operate what the filing describes as gambling markets tied to cancellation rates.

FlightAware maintains that Kalshi previously agreed not to use its data for commercial activities, including gambling or prediction markets.

After learning of the markets, the company canceled Kalshi’s access to its AeroAPI service and issued cease-and-desist notices. The complaint states that Kalshi continued offering the contracts and invoking the FlightAware name.