hour, it needs an additional of fuel to fly 19 hours instead of the standard 15 hours: the increased MTOW and lower payloads will enable the larger fuel capacity. Non-stop flights could last more than 20 hours. The first −900ULR was rolled out without its engines in February 2018 for ground testing. Flight-tests after engine installation checked the larger fuel capacity and measured the performance improvements from the extended winglets. It made its first flight on 23 April 2018. Singapore Airlines, the launch customer and currently the only operator, used its seven -900ULR aircraft on non-stop flights between Singapore and New York City and cities on the U.S. west coast. Singapore Airlines' seating is to range from 170 in largely business class seating up to over 250 in mixed seating. The planes can be reconfigured. They will have two seating classes. The airline received its first -900ULR on 23 September 2018, with 67 business class seats and 94 premium economy seats. On 12 October 2018, it landed the world's then-longest flight at Newark Liberty International Airport from Singapore Changi after 17 hours and 52 minutes, covering for a orthodromic distance. It burned of fuel to cover the route in 17 h 22 min: an average of . As of 2022, the A350-900ULR is used on the longest flight in the world, Singapore Airlines Flights 23 and 24 from Singapore to New York JFK. At the 2015 Dubai Air Show, John Leahy noted the demand of the Middle Eastern Gulf airlines for this variant. In February 2018, Qatar Airways stated its preference for the larger -1000, having no need for the extra range of the -900ULR. Compared to the standard -900, the -900ULR additional value is likely around $2 million. ACJ350 Airbus Corporate Jet version of the A350, the ACJ350, is derived from the A350-900ULR. As a result of the increased fuel capacity from the -900ULR, the ACJ350 has a maximum range of . The German Air Force is to be the first to receive the ACJ350 having ordered 3 aircraft which will replace its 2 A340-300. A350 Regional After the Boeing 787-10 launch at the 2013 Paris Air Show, Airbus discussed with airlines a possible A350-900 Regional with a reduced MTOW of . Engine thrust would have been reduced to from the standard and the variant would have been optimised for routes up to with seating for up to 360