分析家们担心超出承受能力的空中交通控制系统会接近爆点。
Analysts fear the overstretched air traffic control system could reach breaking point.
需要持有明确的空中交通管制许可才能进入B类空域，如接近一个大都会机场。
To enter Class B airspace, such as an approach to a major metropolitan airport, an explicit ATC clearance is required.
在一个接近饱和状态的空中交通系统中，某一区域的任何延误都会像波浪一样传播并触发其它区域的航班延误。
In an air traffic system that operates near capacity, any delays in one region tend to spread like ripples and trigger delays elsewhere.
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