Estimation question
Estimate waiting time at the airport. Come up with a moonshot idea to reduce the waiting time.
- Estimation
- Hard
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What this question tests
Estimation combined with creative but grounded solution design, testing both analytical and product thinking in one answer.
How to approach it
- Break down airport waiting time into components: check-in, security, and gate wait, since each has a different typical duration.
- Estimate each: check-in around 10-15 minutes, security around 20-30 minutes at a busy airport, and gate wait around 20-40 minutes.
- Sum a reasonable total: roughly 60 to 90 minutes of active waiting for a typical domestic traveler.
- Pivot to the moonshot: propose a walk-straight-to-gate biometric system combining pre-cleared identity and security screening done before arrival.
- Explain the mechanism: pre-authorized travelers complete verification via an app before leaving for the airport, collapsing check-in and security into one walk-through.
- Acknowledge feasibility constraints: requires regulatory buy-in and biometric infrastructure, framing it as a phased program for frequent pre-vetted travelers.
What a strong answer includes
- Decomposes the estimate into distinct airport stages instead of guessing one blended wait time.
- Grounds the moonshot in real emerging technology, biometric boarding pilots, rather than pure fantasy.
- Names a concrete adoption path, starting with frequent pre-vetted travelers, showing realistic phased thinking.
- Explicitly acknowledges the regulatory and infrastructure barriers rather than ignoring feasibility.
Common mistakes
- Giving a single guessed wait-time number with no component breakdown.
- Proposing a moonshot idea with no grounding in real, emerging technology or feasibility discussion.
- Ignoring regulatory constraints that can't simply be skipped.
Likely follow-up questions
- How would you pilot this moonshot idea at a single airport first?
- What regulatory hurdles would be hardest to clear?
- How would you handle travelers who aren't pre-vetted under this new system?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 2: Data fluency: SQL, logs, and reading the truth yourself
- Chapter 9: Prove it paid off: outcomes, economics, and pricing
- Chapter 14: Get the job: the AI PM interview loop