For what it's worth, aircraft and airplane are roughly equivalent in meaning, although it is AIRCRAFT which can be considered as having a broader meaning. Theoretically, any flying machine could be called an "air craft" (aerial craft), even blimps or balloons. An airplane (originally spelt "aeroplane") was only one type of flying machines.
Now can you guys stop that nonsense? Filling pages with one misunderstanding after another? English-speakers need to accept the fact that not all members speak English fluently... and non-English-speakers need to accept the fact that they can make mistakes, and not constantly try to justify them. I may have to remove some of these useless posts.