Gulfstream Flies First Fully Outfitted G400 and Sets City-Pair Speed Record En Route to NBAA-BACE
Gulfstream Aerospace Corp. announced on 20 October 2026 that its G400 flight-test programme has added a fully outfitted test aircraft, which has completed its first flight. One of the programme’s experimental G400s also set a city-pair speed record on the way to the 2026 NBAA Business Aviation Convention & Exhibition (NBAA-BACE) in Las Vegas.
The outfitted aircraft flew from Dallas Love Field Airport for 2 hours, 46 minutes and reached 48,000 feet, according to Gulfstream. It has an 11-passenger configuration over two-and-a-half living areas. It is dedicated to evaluating cabin systems at altitude and testing functionality and comfort in flight. The earlier G400 test aircraft have focused mainly on flight performance and airframe validation.
The speed record came on the Miami-to-Las Vegas leg, flown by one of three experimental G400 test aircraft. Gulfstream said the flight took 4 hours and 8 minutes at an average speed of Mach 0.89, using a blend of sustainable aviation fuel (SAF). Gulfstream city-pair records are typically submitted to the U.S. National Aeronautic Association for accreditation. Gulfstream’s announcement did not say whether this one has been submitted.
“The first flight of our outfitted G400 and this latest speed record reflect the discipline, experience and momentum behind the program. With the largest cabin in its class, the G400 provides customers an environment never before seen in this category, and we are excited to continue to refine the interior fit and finish as we prepare this exceptional aircraft for entry into service. The aircraft continues to perform exceptionally well as we advance through the rigorous certification program. Each milestone reinforces the performance, cabin comfort and versatility customers will experience with this remarkable aircraft.”
Mark Burns, president, Gulfstream
The manufacturer said the programme has also flown high-altitude tests in Telluride, Colorado, and cold-weather tests in Iqaluit, Canada, among other validation work.
At NBAA-BACE, Gulfstream is displaying a G400 experimental test aircraft and a cabin mock-up. They sit alongside the G700, G800, G500 and G600, and a mock-up of the new G300. Trade publication Aviation International News reported that the record-setting test aircraft is appearing at the show’s Aircraft Connection static display.
The G400 first flew in August 2024 from Savannah/Hilton Head International Airport. According to Gulfstream’s announcement at the time, it stayed airborne for 2 hours, 54 minutes and reached Mach 0.85 and 41,000 feet on a blend of SAF. Gulfstream describes it as the smallest member of its large-cabin family. It uses the high-speed wing and winglet introduced on the G500 and G600, Pratt & Whitney Canada PW812GA engines and the Symmetry Flight Deck. Its quoted range is 4,200 nautical miles at Mach 0.85.
The outfitted G400 marks a natural next step for the programme. Aircraft with a full interior typically join the test fleet once the airframe and systems have matured enough for cabin work to begin in earnest. That means Gulfstream can now evaluate the cabin in flight, including how systems behave at altitude and how comfortable the space is for passengers, alongside the performance testing already under way.
Gulfstream has not yet named a certification date. That is in step with the wider industry. Aviation Week reported that recent certification campaigns at both the FAA and EASA have been more demanding, particularly on software validation, and Burns declined to forecast timelines for the G400 and G300 while saying flight-test activity on both is picking up. The company also expects to apply lessons from the G700 and G800 programmes, which should help it as testing continues.
The speed record adds a welcome demonstration of the aircraft’s capability and of SAF in everyday operations. City-pair records are a long-standing Gulfstream tradition, with hundreds across the fleet. They are best read as a snapshot of what the aircraft can do on a given day rather than a certification milestone. The Mach 0.89 average sits above the Mach 0.85 cruise speed on which the aircraft’s 4,200-nautical-mile range is based, so the two figures describe different operating conditions.
For the wider market, the G400 helps round out a refreshed Gulfstream family. The G300, which first flew in December 2025 and is targeted for 2027, serves the super-midsize segment. The G500 and G600 sit above the G400, followed by the G700 and G800. Burns has said the commonality across these aircraft was intentionally designed. If that holds, operators with mixed fleets could see benefits in training and maintenance, and customers moving up through the range could find the transition easier.
Owners and prospective buyers will be watching test progress and any firm service-entry announcement over the coming months. Having the G400 on display at NBAA-BACE, alongside a cabin mock-up, gives visitors a chance to see the interior themselves while that work continues.
Photos by the respective brands.
Cover photo by Gulfstream.
