研究称必须对航空交通管理系统进行彻底的改革。
The study says there must be a complete overhaul of air traffic control systems.
自上世纪50年代以来，航空服务一直依赖于地面导航的航道系统，飞机被迫按低效航线飞行，以与空中交通管理员保持联系。
Air travel still relies on a ground-based tracking system from the 1950s, which forces planes to use inefficient routes in order to stay in contact with controllers.
民用航空体系主要由航空公司、机场和空中交通管理三大部分组成。
The system of civil aviation includes airline companies, airports and air-traffic management departments.
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