Estimation question

Estimate waiting time at the airport. Come up with a moonshot idea to reduce the waiting time.

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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

  1. Break down airport waiting time into components: check-in, security, and gate wait, since each has a different typical duration.
  2. Estimate each: check-in around 10-15 minutes, security around 20-30 minutes at a busy airport, and gate wait around 20-40 minutes.
  3. Sum a reasonable total: roughly 60 to 90 minutes of active waiting for a typical domestic traveler.
  4. Pivot to the moonshot: propose a walk-straight-to-gate biometric system combining pre-cleared identity and security screening done before arrival.
  5. 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.
  6. Acknowledge feasibility constraints: requires regulatory buy-in and biometric infrastructure, framing it as a phased program for frequent pre-vetted travelers.

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