We human usually anticipate the idea of speed by either visual of relative movement or wind blowing in our face, which is why you might think a car on the highway is still when it is travel at the same speed as yours and why we cannot feel the Earth rotating at a crazy speed when the atmosphere we are in rotates together with us.
In the case of airplane flight, we do not feel the speed since everything is so far from us and move so slowly in our eyes, in turn make us feel like we are moving slow. Trust me, if you fly pass a floating Superman you will be able to tell how fast you are travelling.
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