Prioritize SLA alignment with ferry and air schedules, proximity to ferry terminals or the airport, cross-dock and storage capacity, cold-chain capabilities, returns processing, WMS/API visibility, and carrier agreements for mainland consolidation. Also review seasonal staffing plans and contingency options for weather-related disruptions.

Ferry shipments have lower frequency and longer lead times while airfreight reduces transit time at higher cost. Model reorder points using carrier schedules and vessel capacity, build buffer stock for peak seasons, and consider consolidation to reduce per-unit freight costs when calculating total cost-to-serve.

Look for temperature-controlled storage with traceability, fast pick-and-pack, batch/lot control, and coordination with ferry/air departures. Certifications for food safety or cold-chain handling, electronic tracking, and SLA-based dispatch windows are key for perishable and regulated goods.

Compare total landed costs: on-island warehousing reduces last-mile expense and improves delivery speed on Jeju, while mainland hubs offer lower inbound freight per unit. Calculate cost-per-SKU-turn, service penalties, and inventory carrying costs; consider hybrid models with local safety stock and mainland JIT replenishment to balance responsiveness and cost.