Flight-tracking company FlightAware has sued prediction-market operator Kalshi, accusing the service of using its data and trademark without permission to settle wagers on US flight cancellations. FlightAware is seeking a temporary restraining order and permanent injunction to stop Kalshi from using its data and brand in connection with the markets. Kalshi initially paused plans for the flight-cancellation contracts following the objections, but later offered cancellation markets using FlightAware information, according to the lawsuit and published reports. FlightAware alleges it repeatedly sent cease-and-desist demands to Kalshi but that the company continued using its data and referring to FlightAware on its website. Kalshi later added a disclaimer stating that FlightAware was not affiliated with or endorsing the markets.