Singapore Airlines Flight SQ23, which connects Singapore Changi Airport (SIN) and John F. Kennedy International Airport (JFK) in New York, is the longest flight in the world. Depending on the weather, this ultra-long-haul journey takes about 18 to 19 hours nonstop and covers about 9,537 miles (15,349 kilometers). An Airbus A350-900ULR, specially outfitted for ultra-long-range comfort, is used for the journey. It is a true test of endurance and engineering because it does not have economy class and instead focuses on passenger comfort during the lengthy journey.