说到成本，我不确定你指的是美林的哪一项研究，但用美国各地窄体飞机运营的座位-英里成本做比较，未免过于简单。
Turning to cost, I am not sure to which Merrill Lynch study you are referring, but it would be simplistic to compare seat-mile costs of narrow-body operation over U.S.
飞机机械师和飞机检查员受雇于飞机制造，维护，修理和大修机构，航空公司和其他飞机运营商。
Aircraft mechanics and aircraft inspectors are employed by aircraft manufacturing, maintenance, repair and overhaul establishments, and by airlines and other aircraft operators.
国家监管人员依据飞机运营商的评估作出决定。飞机运营商制定飞行计划，提供设备，跟踪火山灰的位置。
National regulators would make decisions based on assessments by aircraft operators that took in flight plans, equipment and the ash's disposition.
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