Regarding the number of proposed starlink satellites: The constellation is proposed to be approximately 10,000 satellites. I wondered how this compares to the number of US commercial flights per year. The FAA claims it handles 45,000 flights per day [1]. If we assume each aircraft has 5 flights per day and spends half it's time on the ground, then we might guess there are approximately 4,500 aircraft flying above the…
That is an interesting comparison though! And it'd be cool to compare with more nuanced assumptions - maybe even factor in how contrails affect things in addition to the 1:1 satellite:plane maths.