For example, all a VFR pilot has to do to enter Class C airspace is establish two-way radio contact with ATC.

例如，VFR 飞行员进入 C 类空域所要做的就是与空中交通管制建立双向无线电联系。

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They made human contact, and encouraged the pilot to use his authority to help them.

他们直接与人做了交道，并鼓励驾驶员使用他的权力来帮助他们。

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As the plane crossed state lines neither pilot realized the jet no longer was on the correct radio frequency and that controllers were growing worried about their failure to stay in contact.

飞机随后飞越了州界，两位飞行员都没有意识到飞机已经不在准确的无线电频率上，而地面塔台也对无法与飞机保持联系感到越来越担忧。

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CNN's Mike Hanna in Jerusalem said the plane was tracked by Israeli warplanes and helicopters, who established radio contact and made repeated attempts to contact the pilot, but he refused to respond or identify himself.

CNN: Israel shoots down light aircraft