Its not about the speed, its about the difference in speed between you and whatever your standing/sitting in. In an airplane in the air you are moving at the same velocity as the airplane, because well, you are in the airplane.
Think of it like this. there is a house on the ground, you are standing in an airplane. The airplane lets say moves at 900km/h above the house.
Now lets make the airplane invisible, its still there just invisible. Now everyone in the house would see you standing in the plane instead, but according to them you would still be flying past the house at 900km/h.
The difference in speed between you and the plane is 0km/h therefore you cant feel it, the difference in speed between you and the house on the ground is 900km/h.
Infact, if you are walking forward in an airplane, you are moving slightly faster than the plane, and if you are walking back in the plane you are moving slightly slower.
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