呼叫代码 meaning in Chinese

call codes
calling code

The radio call sign for aircraft used to transport the president of the united states . any aircraft used to carry the president is referred to as air force one
无线电呼叫代码，专指美国总统专机。任何载有美国总统的飞机都叫空军一号。
Northwest airlines call sign used by someone , airport made every effort to get someone to respond to incident site and the acc . northwest not participating
有人使用了西北航空公司的呼叫代码，机场利用各种途径寻找人员前往事故现场和机场指挥中心。但西北航空公司并未参加。