The U.S. Internal Revenue Service (IRS) is under scrutiny for accessing a vast database of American travelers’ flight information without a warrant, according to a letter signed by a bipartisan group of lawmakers. The letter, obtained by 404 Media, reveals that the IRS obtained data on hundreds of millions of travel records, including the times and locations of flights and the credit cards used, without following legal procedures such as obtaining a search warrant or court order. The data is sourced through a data broker, Airlines Reporting Corporation (ARC), which is co-owned by major airlines such as Delta, United Airlines, American Airlines, and Southwest. The airlines funnel customer records to ARC, which then sells access to government agencies, allowing these agencies to legally purchase the data without prior judicial review. The lawmakers’ letter, addressed to the airlines, criticizes this practice and urges them to terminate their data sharing agreements. An update indicates that ARC has already announced plans to shut down the data selling program.