President Trump’s budget request for fiscal 2018 effectively would privatize air traffic control, a move that the union representing those workers, the National Air Traffic Controllers Association, indicated to the Washington Examiner it may back.

Under the president’s budget, control of air traffic would be moved to a nonprofit organization spun off from the Federal Aviation Administration by 2021. The budget cites a bill proposed last Congress by House Transportation Committee Chairman Bill Shuster, R-Pa., the Aviation Innovation, Reform and Reauthorization Act, as its model.