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Point of Focus
- FlightAware alleges Kalshi used its data, name, and trademarks without permission.
- The lawsuit raises safety concerns that such markets could financially incentivize flight or airport disruptions.
- The dispute could establish important rules governing third-party data.
Flight-tracking company FlightAware has sued Kalshi, alleging that the prediction-market operator used its name, trademarks, and data without permission to settle wagers on US flight cancellations.
The complaint, filed in the US District Court for the Southern District of New York, intensifies scrutiny of prediction markets as Kalshi and rival Polymarket surpass $150 billion in combined lifetime trading volume.
FlightAware alleges unauthorized data use
Kalshi introduced contracts tied to the number of flight cancellations nationwide and at individual airports in July. One contract covering US cancellations for the week ending Aug. 14 reportedly told traders that its outcome would be verified using FlightAware.
FlightAware claims it never authorized Kalshi to use its data, branding, or name for those markets. According to the complaint, Kalshi’s presentation could have led customers to believe FlightAware participated in or endorsed the contracts.
FlightAware sues Kalshi in federal court. The flight tracking site is seeking an injunction and damages over the use of its name and data. pic.twitter.com/rlrqmpNS8r
— Mick Bransfield (@MickBransfield) August 11, 2026
The tracking company said it only learned about the markets through media coverage and alleges that Kalshi continued displaying its information after being asked to stop.
FlightAware is seeking unspecified damages, a jury trial, and court orders preventing further use of its intellectual property.
Kalshi did not publicly respond to requests for comment at the time of the initial reports.
Cancellation markets raise safety concerns
The dispute extends beyond data ownership. FlightAware argues that markets paying out when flights are canceled could create incentives for manipulation or deliberate disruption, potentially threatening passengers, aviation workers, and airport operations.
Prediction markets allow traders to buy contracts based on the outcome of future events, including elections, sporting contests, and geopolitical developments.
ICYMI: FlightAware sued Kalshi yesterday over flight-cancellation betting markets.
Kalshi launched prediction markets allowing people to bet on flight cancellations nationwide and at specific airports. It named FlightAware as the “Primary Source Agency,” displayed the… pic.twitter.com/7JDjGwByht
— Ariel Givner (@GivnerAriel) August 11, 2026
Although platforms prohibit improper trading, critics have questioned whether people with privileged information, or the ability to influence an outcome, could profit unfairly.
Flight-cancellation contracts sharpen that concern because their underlying events affect physical infrastructure and public safety. The lawsuit may test how platforms select settlement sources and manage markets involving potentially disruptive real-world outcomes.
Legal pressure grows alongside trading volume
The case comes as prediction markets rapidly expand their commercial reach. Kalshi and Polymarket recorded more than $150 billion in combined lifetime trading volume by April, although their seven-month streak of monthly growth subsequently cooled.
Kalshi has separately said its annualized trading volume reached $178 billion after more than tripling in six months.
Kalshi at a $4B run rate, up from $2B 2 MONTHS ago.
The World Cup was huge for them.
Now raising at $40Bhttps://t.co/ROuCKpfdLX pic.twitter.com/CZLHTokk0d
— Sheel Mohnot (@pitdesi) August 11, 2026
The company raised $1 billion at a reported $22 billion valuation, while its institutional volume reportedly increased 800% over the same period.
That growth gives the FlightAware case broader significance. A ruling restricting how platforms use third-party data may force prediction markets to secure clearer licensing agreements, redesign settlement procedures, and reconsider contracts carrying manipulation or safety risks.
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