9.8m/s^2 on Earth*... and even then it also depends on where on Earth you are, gravity at the equator is slightly different from the poles and it's also different from the top of Everest vs Sea level. Either way, yeah, it would accelerate, even if there was air in it's way.
I had this argument with a pilot, his contention is that the wind currents generated from the spinning globe negate any “distance” travelled by remaining at a fixed point in space.
It's not wind current, but it is a way of understanding it. If you're in a car then you are moving WITH the car at 60mph. Everything in the car is moving the same speed as the car, so it seems normal. It's the same with the Earth. You are moving around the Earth at the same speed you are rotating - even if you are in the air as all of the air is doing this as well.
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