Your question is Estimate Flights Over the US. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You're in a strategy interview for a research role where you need to make a fast estimate from limited information. The interviewer wants to see how you break a broad question into workable parts, choose reasonable assumptions, and sanity check the result.
How would you estimate the total number of commercial flights currently in the air over the United States?