Because humans don’t really gauge speed without any visual cues. What we feel is the change of speed or acceleration (and you do feel that with the plane).
Try driving on an autobahn for a few hours and something like a 100 miles per hour will feel very slow when everyone else is going faster.
Also you don’t feel any speed standing on earth that’s going at thousands miles an hour but if the earth was to suddenly accelerate x2 you’d feel that.
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