The Skyfleet S570 is a fictional, cutting-edge prototype aircraft that appears in the 2006 James Bond film Casino Royale. It's depicted as a massive double-deck, wide-body, four-engine jet airliner built by the equally fictional Skyfleet Aviation, and in the movie, it's touted as the "largest airplane in the world."
For the film, the production team actually modified a decommissioned Boeing 747-200 to bring the S570 to life. They altered the engines, giving it a unique propulsion system, and adjusted the cockpit profile to make it look more experimental. Digital enhancements were then added in post-production to complete the futuristic design.
The Skyfleet S570 is central to a major plot point in Casino Royale. The villain, Le Chiffre, plans to destroy this valuable prototype to manipulate Skyfleet's stock prices. However, James Bond intervenes, preventing the disaster. So, while the prop used for filming was a real aircraft, the Skyfleet S570 itself is a product of cinematic imagination, serving as a high-stakes target and a symbol of advanced aerospace technology within the Bond universe.

Thanks to Chatgpt