虽然squawk代码通过飞机的应答机发送，但飞行员可以使用Mayday呼叫来提醒空中交通管制部门有关严重紧急情况。
While squawk codes are sent through an aircraft’s transponder, pilots can use a Mayday call to alert air traffic control about a serious emergency.
印度斯坦时报
什么是squawk 7500？在flydubai航班恐慌中发出的“劫机”代码What is squawk 7500? The ‘hijack’ code issued amid flydubai flight scare
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