That suggests the helicopter may have been flying in a blind spot for Steve Altman, the pilot of the Piper Lance and one of the brothers aboard.
这显示出直升机当时可能正在私人飞机驾驶员、两兄弟之一的艾特曼(Steve Altman)的盲区中飞行。 观光直升机由总部位于新泽西州的Liberty Tours运营。
Another method is to abandon original system, carrying out unified on the basis of success at pilot spot. The cost is as large as the previous way.
另一种建设方式是对各级系统推倒重来，在试点成功的前提下统一建设，但所付出的资金、人力消耗、以及对新系统的开发、培训和适应成本也是同样巨大的。
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