Given flight records with departure airport, departure time, arrival airport, arrival time, and user id, implement a function that returns where a given user is at a specified time. The answer should account for whether the user is at an airport or currently in flight. ### Constraints & Assumptions - Flight intervals for a user do not overlap unless clarified. - Times can be compared after parsing into a single timezone. - The input may contain records for many users. - Return values should distinguish airport, in-flight, and unknown states. ### Clarifying Questions to Ask - If the query time is exactly the departure time, is the user at the origin or in flight? - If it is exactly the arrival time, is the user at the destination? - Should the function return the flight id when in flight? - Can users have connecting flights or missing initial location? - How large is the input? ### What a Strong Answer Covers ```premium-lock What a Strong Answer Covers ``` ### Follow-up Questions - How would you support many repeated queries? - How would delays or cancellations change the model? - How would you handle time zones? - How would overlapping records be detected?