That threshold, the CAA says, was provided on the basis of data from equipment-manufacturers;
CAA说，这是设备生产商依据数据提供的临界点；
2
The CAA said ash levels would now be graded as low, medium or high, and airlines would be notified if levels reached medium or high.
CAA说，火山灰的等级分为低、中、高档，如果达到中档或高档，将通知航空公司。
3
When London's airports were privatised two decades ago in a bundle, and the Civil Aviation Authority (CAA) given responsibility for capping landing fees and other charges.