When you are on board a train,ship,or aircraft,it means you are on it or in it.
你所说的on board the aircrafe,指的是正在飞机上的意思,在飞机上自然是on board the aircrafe,不过你如果在地上,用的就是on the aircrafe,（ps：on broad还有登机的意思,希望不要混淆）
Smoking is not allowed on board the aircraft.
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