Why doesn't the fly get smashed against the back window when driving?

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Have you ever wondered how flies can fly around in the moving vehicle without being smashed against the back glass? I have, and I think I have found the answer. You're all in a capsule of air inside the car moving down the road more or less as a stationary unit, particularly if all the windows are closed. If the air itself (inside the car) was moving at 70 mph, among other things, your dog wouldn't have to stick its head out the window to get some wind. But when the time comes that you want the fly gone, then I suggest you open all the windows. One thing the moving air does is create its own low-pressure zone around the car. As a rule, air moves from higher-pressure areas (inside your car) to lower-pressure areas (outside your car). It is something they teach you in physics. Did you know this? Did you find this interesting? Have you ever been curious of this?