No-one is saying the laws of physics change from one frame of reference to another. But there are forces that act on an inertial mass in relation to its position in reference to the earth (and other gravitational fields), so that when an aircraft changes direction in a constant air mass, the two inertial masses (air mass and aircraft) initially diverge in terms of reference. The sum of the difference can be calculated, but makes no appreciable difference to the air speed of an aircraft close to the earth's surface. That is my understanding.