Travel platform recommends staged retrieval for accurate itinerary answers

A technical article proposes a staged retrieval architecture for travel itinerary planning systems. The design uses separate collections for lodging, transport, and activities to handle varying data freshness and quality. It recommends a four-stage process with strict latency budgets totaling 450 milliseconds for interactive requests. The system prioritizes returning fewer verified listings over waiting for a larger, unverified set. The approach emphasizes defining required evidence fields for each answer before retrieval begins.