Clarify the scope (geographic boundaries, time frame, and whether 'Bay Area' includes all airports or just major ones) and state your assumptions. Then use a structured estimation approach, breaking the problem into components like flight frequency, airspace capacity, and average flight duration, and calculate a reasonable range.
Pro tip: Acknowledge that this is a Fermi problem where the process matters more than the exact number; demonstrate your ability to make reasonable assumptions and sanity-check your answer.
Ask clarifying questions to define the Bay Area boundaries, time frame (e.g., current moment, average day), and whether to include all aircraft types (commercial, private, cargo).
List major airports in the Bay Area (SFO, OAK, SJC) and estimate their daily flight operations (takeoffs and landings) based on known statistics or reasonable guesses.
Determine the average time an aircraft spends within the defined Bay Area airspace, considering approach and departure paths (e.g., 10-15 minutes).
Use Little's Law: number of planes = arrival rate × average time in system. Convert daily operations to per-minute rate and multiply by average duration.
Compare your estimate to known data (e.g., FlightRadar24) or adjust for factors like peak hours, general aviation, and overflights, and present a range.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.