The handover of about 300 airport towers and other flight tracking centers would be one of the largest transfers of U.S. government assets. Some politically influential business aircraft operators, private pilots, small aircraft manufacturers and medium- and small-sized airports fear airlines will dominate the corporation's board, resulting in higher fees for them and less service. The idea is to remove air traffic control from the vagaries of the government budget process, which has limited the Federal Aviation Administration's ability to commit to long-term contracts and raise money for major expenditures. Many countries have created government-owned corporations, independent government agencies or quasi-governmental entities. [...] the nonpartisan Congressional Research Service reported last month that there appears to be no conclusive evidence that any of those approaches is better or worse than government-run services, including the FAA's, in terms of productivity, cost-effectiveness, service quality, and safety and security. The U.S.