The double-deck A380 is the world’s largest commercial aircraft flying today, with capacity to carry 525 passengers in a comfortable three-class configuration, and up to 853 in a single-class configuration that provides wider seats than its competitor. Overall, the A380’s two decks offer 50 per cent more floor surface than any other high-capacity aircraft.
With its range of 8,300 nautical miles, the A380 is the ideal solution to alleviate traffic congestion at busy airports. It has two full-length passenger levels with true widebody dimensions: a main deck and an upper deck, which are conveniently linked by fixed stairs forward and aft.
source airbus.com