Gulfstream G400 Cabin Test Aircraft Flies as Business Jet Sets Miami–Las Vegas Speed Record

The outfitted prototype reached 48,000 feet on its first flight, while another experimental G400 completed the Las Vegas journey in four hours and eight minutes using an SAF blend.

KEY TAKEAWAYS

• Gulfstream’s fully outfitted G400 test aircraft completed a 2-hour 46-minute first flight from Dallas Love Field and reached 48,000 feet.
• An experimental G400 flew Miami to Las Vegas in four hours and eight minutes at an average Mach 0.89 using a sustainable aviation fuel blend.
• The outfitted aircraft will evaluate cabin systems and passenger comfort in an 11-seat configuration.
• High-altitude and cold-weather trials are among the ongoing steps toward G400 certification.

Gulfstream Aerospace has taken another step toward bringing its G400 business jet to market, completing the first flight of a fully fitted cabin test aircraft while reporting a new Miami-to-Las Vegas city-pair speed record during preparations for the 2026 NBAA Business Aviation Convention & Exhibition (NBAA-BACE).

The two developments highlight different priorities in the same certification campaign: proving how the aircraft performs at speed and altitude, and testing the systems and passenger environment that will eventually accompany customers on their journeys. Gulfstream announced the milestones on October 19, 2026, with the G400 still undergoing flight testing rather than operating as a certified commercial aircraft.

Passenger cabin joins the flight-test programme

The fully outfitted test G400 departed Dallas Love Field Airport on its maiden flight and remained airborne for two hours and 46 minutes, reaching 48,000 feet. Its interior has seating for 11 passengers arranged across two-and-a-half living areas. Unlike a test aircraft equipped primarily for performance measurement, this aircraft is intended to evaluate cabin systems, functionality and comfort under real flight conditions.

Those tests matter to business aviation customers because the aircraft’s eventual travel experience depends on more than published range and speed. Systems must work as intended at altitude, and cabin arrangements need validation in the environment in which passengers will use them.

On its G400 aircraft information page, Gulfstream lists a preliminary maximum range of 4,200 nautical miles and a maximum operating speed of Mach 0.90. The manufacturer notes that actual range varies with weather, routing, loading and other operating conditions, and that performance figures remain subject to change.

Speed-record claim on the way to Las Vegas

Separately, one of the programme’s experimental G400 aircraft flew from Miami to Las Vegas in four hours and eight minutes, averaging Mach 0.89, according to Gulfstream. The company described the journey as a new city-pair speed record. The flight used a blend incorporating sustainable aviation fuel (SAF), demonstrating that the aircraft can undertake high-speed test missions while using an alternative fuel blend.

The claimed record was timed to the industry gathering in Las Vegas, where Gulfstream is exhibiting the experimental G400 and a cabin mock-up. Other aircraft and displays in the company’s NBAA-BACE presence include the G500, G600, G700 and G800, together with a G300 mock-up.

Certification work continues

Gulfstream said its test programme has also included operations at high altitude in Telluride, Colorado, and cold-weather evaluations in Iqaluit, Canada. Such missions expose the aircraft to operating conditions beyond routine flights as the manufacturer collects data for development and certification.

Mark Burns, president of Gulfstream, said the first outfitted flight and latest record reflected progress by the development team. He also pointed to work on the G400’s interior fit and finish as the company prepares for eventual entry into service. Gulfstream has not established a definitive certification date in the announcement.

The G400 occupies a place in Gulfstream’s expanding business-aircraft family between its smaller and larger models. For operators weighing fleet options, completion of cabin trials and continued performance testing will be important milestones, but certification and entry into service remain ahead. More information is available through Gulfstream’s newsroom.