Ultra-long-haul (also known as "ultra-long-range operations" ) refers to the duration of a flight (flight duration) being "ultra long." IATA, ICAO, and IFALPA jointly define any flight scheduled to last over 16 hours as "Ultra Long". The longest ultra-long-haul commercial flight in the world currently is Singapore Airlines Flight SQ 23/24, which flies from Singapore Changi Airport to New York JFK Airport.