What shall pilots be extremely concentrated on while operating in airspace with mixed traffic?

Вопрос, который задают на SELCAL - What shall pilots be extremely concentrated on while operating in airspace with mixed traffic? Paraphrase: What should a pilot consider while operating in airspace with mixed traffic?

Вариант ответа на данный вопрос -
Pilots have to concentrate on or pay special attention to airborne separation and TCAS signals while operating in mixed traffic airspace. Also they should listen attentively to ATCos.

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