Why don’t we, as passengers, feel the speed of a plane whilst it is flying?

Question

Also why aren’t we constantly sucked back into our chairs like when u accelerate in a car quickly?

In:

Answer 1

The plane is cruising at a constant speed. You feel the accelaration at take off but once the speed of the plane (and your speed too) is constant you wont feel it just like in a car too.