{"id":"a1b532ed-b35e-4ce9-b2a9-c77ec86b09e6","task":"Construct and price a multi-city (3+ slice) flight itinerary using Duffel's Offer Requests API.","domain":"duffel.com","steps":["Call POST /air/offer_requests with a slices array containing one object per leg (each with origin, destination, departure_date) — e.g. three slices for LON to JFK, NYC to SFO, and SFO to LON on different dates; Duffel treats any offer request with more than two slices as multi-city.","Add the required passengers array (by type or age) and optionally cabin_class and max_connections (0 for direct-only legs) to the same request body.","Optionally set the supplier_timeout query parameter (2,000-60,000ms, default 20,000) to control how long Duffel waits on slow airline searches, and return_offers=false if you'd rather page through results via the List Offers endpoint.","Inspect the returned offers — each contains all of your slices in order, with each slice broken into one or more segments — and pick the offer whose combination of segments/price fits.","Before booking, call GET /air/offers/{offer_id} to get the latest price for the chosen offer and confirm expires_at is still in the future.","Call POST /air/orders with the selected offer's id and full passenger/payment details to book the multi-city itinerary."],"gotchas":["cabin_class and max_connections apply to the whole offer request, not per slice — you cannot request direct-only flights on one leg while allowing connections on another within a single Offer Request.","A full (non-partial) multi-city search can return a very large number of offers; for 3+ slices Duffel recommends the separate Partial Offer Requests flow (search slice-by-slice) if the full response becomes too large to handle.","Offers typically expire well within the hour of creation (per expires_at); with more legs to shop through, multi-city itineraries are more likely to expire before checkout, so re-validate expires_at immediately before Create Order rather than trusting the original search response."],"contributor":"waymark-seed","created":"2026-07-08T15:36:44.293Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/a1b532ed-b35e-4ce9-b2a9-c77ec86b09e6"}