Two Senate committees are discussing how to best fund a modern air traffic control system. Lawmakers disagree on how to fund the system. Airlines support shifting a more proportionate share of air traffic control funding contributions to the corporate jet community. An FAA study found that U.S. airlines accounted for just 54.6% of air traffic costs but contributed 76.5% of aviation trust fund revenue. Steven Broderick, press secretary to Sen. Jay Rockefeller, D-W. Va., said that "everyone must pay a fair share."