Hazrat Shahjalal International Airport — Dhaka, Bangladesh

Named for a revered thirteenth-century Sufi saint credited with spreading Islam across the Sylhet region, DAC serves as Bangladesh's principal gateway and its busiest airport by a wide margin. Dhaka ranks among the most densely populated cities anywhere, and passenger volumes have long outpaced infrastructure built to handle them, causing chronic congestion at peak hours. A newer third terminal, built with international design and engineering input, was added to relieve pressure on the aging original buildings and substantially boost annual capacity. The airport anchors long-haul connections to the Middle East, Europe, and East Asia that serve Bangladesh's huge overseas labor workforce, whose remittances form a critical share of the national economy. Biman Bangladesh Airlines bases its main hub operations here alongside numerous foreign carriers serving the crowded capital.