The near-negligible Coriolis force can be felt (barely) at velocities which planes reach. This could tip of the inner-ear to a bank, if ever so slightly. Howe

The near-negligible Coriolis force can be felt (barely) at velocities which planes reach. This could tip of the inner-ear to a bank, if ever so slightly. However, this force is many orders smaller than the centrifugal force that the authors is talking about. However, I don't think it's technically correct to say the passengers "have no way of guessing the airplane's degree of bank."