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A major independent flight tracking platform, which has made enemies of the Saudi royal family and Elon Musk, has been sold to a subsidiary of a private equity firm. And its users are furious.

ADS-B Exchange has made headlines in recent months for, as AFP put it, irking “ billionaires and baddies. ” But in a Wednesday morning press release, aviation intelligence firm Jetnet announced it had acquired the scrappy open source operation for an undisclosed sum.