Hamad International Airport (DOH) in Doha is considered a massive, world-class aviation hub and one of the most significant transit points in the Middle East. Spanning over 22 square kilometers, it is roughly two-thirds the size of the city of Doha itself. In 2026, its "big" status is defined not just by its physical footprint but by its immense capacity; the airport recently completed a major expansion (Phase B) that allows it to handle over 60 million passengers annually. The centerpiece of the airport is "Orchard," a 6,000-square-meter indoor tropical garden with a water feature, which rivals Singapore’s Changi in scale and luxury. For travelers, the "size" means long walking distances, though an automated "Passenger Train" connects the concourses. It features a single, vast terminal building that is highly efficient but takes about 20 to 30 minutes to traverse from end to end on foot. With over 100 aircraft parking stands and a constant influx of wide-body jets from Qatar Airways, it is undeniably one of the "megahubs" of the 21st century.