Birjand Airport matters in the Hormuz Graph because South Khorasan is a large, low-density eastern province where distance, desert geography, border proximity, and weak logistics density make air access unusually important. The airport connects the provincial capital to national administrative, business, education, mining-service, and border-related travel flows. Its relevance is not major passenger scale, but reducing access friction for a province tied to eastern corridors, Afghanistan-facing commerce, mineral potential, agriculture, and public-sector activity far from Iran’s main metropolitan centers.