"A data broker owned by the country’s major airlines, including Delta, American Airlines, and United, collected U.S. travellers’ domestic flight records, sold access to them to Customs and Border Protection (CBP), and then as part of the contract told CBP to not reveal where the data came from, according to internal CBP documents obtained by 404 Media. The data includes passenger names, their full flight itineraries, and financial details.
CBP, a part of the Department of Homeland Security (DHS), says it needs this data to support state and local police to track people of interest’s air travel across the country, in a purchase that has alarmed civil liberties experts.
The documents reveal for the first time in detail why at least one part of DHS purchased such information, and comes after Immigration and Customs Enforcement (ICE) detailed its own purchase of the data. The documents also show for the first time that the data broker, called the Airlines Reporting Corporation (ARC), tells government agencies not to mention where it sourced the flight data from.
“The big airlines—through a shady data broker that they own called ARC—are selling the government bulk access to Americans' sensitive information, revealing where they fly and the credit card they used,” Senator Ron Wyden said in a statement."
https://www.wired.com/story/airlines-dont-want-you-to-know-they-sold-your-flight-data-to-dhs/