> Above the Karman Line (62mi/100km up), the air is thin enough that there barely any air resistance. I On the contrary, even at the altitude of the ISS there

> Above the Karman Line (62mi/100km up), the air is thin enough that there barely any air resistance. I On the contrary, even at the altitude of the ISS there is sufficient atmosphere to reduce its velocity by around 5 metres / hour under normal conditions. Particle density at 400 km altitude is 10E+15 particles / cubic metre ( about a billion times less than at sea level ( but much more at times of Solar flaring. The ISS makes a sonic boom which propagates to the ground, it's just incredibly weak.