一般來說大型民航客機沒有鑰匙。客機的機艙門和引擎都不需要鑰匙來開啟。客機的機門通常由機務手動或電動方式打開；引擎則由機師透過電腦系統面板按鈕來啟動。客機沒有鑰匙的主要原因是，客機大多停放在機場內，受到嚴密的安全監控。客機的引擎啟動需要經過一系列複雜的程序，並且需要有專業的知識和技能，即使有人能夠進入飛機內部，也難以啟動飛機。當然，有些小型飛機，如私人飛機，可能會配備鑰匙防止飛機被盜。
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Do commercial airplanes need keys to start?
Commercial airplanes do not need keys to start. The cabin doors and engines of commercial airplanes do not require keys to open or start. Cabin doors are usually opened manually or electrically by ground crew, and engines are started by pilots through buttons on the computer system panel.There are a few reasons for this. First, commercial airplanes are usually parked at airports, which are under tight security. Second, starting a commercial airplane engine requires a series of complex procedures and professional knowledge and skills. Even if someone could enter the aircraft, it would be difficult for them to start it.
Some small aircraft, such as private planes, may be equipped with keys to prevent theft. However, for most commercial airplanes, keys are simply not necessary.
