A two-thirds scale model of the TriFan 600 aircraft made a first flight in the first week of May 2019. This was 10 months later than had originally been projected in XTI Aircraft's timeline for the program. The company aims to achieve type certification by the end of 2023.
In June 2019, XTI claimed to have received 81 "pre-orders" from prospective operators in North America and Australia, with a combined value of around $500 million (implying a unit price of $6.5 million). This included an order from Australia-based Heliflite, with which XTI now has an exclusive partnership in Australasia, Oceania, and Indonesia. It also included an order from Brazil-based operator Icon Aviation
On July 23, 2019, XTI selected GE Aviation's Catalyst turboprop engine to power the TriFan 600. XTI Aircraft did not say when a full-scale prototype powered by this engine will be ready to join the flight test program, and the Catalyst is due to complete its own certification process in 2020. The aircraft uses XTI's patented ducted-fan technology, with one fan on each wing and another in the rear of the fuselage. The wing-mounted fans turn forward when the aircraft transitions from vertical to horizontal flight and at that stage the rear fan is covered.
In September 2019, XTI received a Japanese patent covering its TriFan 600 design. In the same month, it signed a draft joint venture agreement with an undisclosed company in Guizhou province, China, covering possible assembly and support for the aircraft.
On October 2, XTI announced that it has moved its 65 percent-scale proof-of-concept prototype to an approved test site in northern Utah, where the next phase of flight testing is due to begin. As of that date, the prototype had made 21 flights, testing controlled takeoffs, hover and landing. The company reported that it has fully installed, tested, and validated the aircraft's electric motors, battery system, ducts, propellers, flight controls, electrical systems, and instrumentation.
The TriFan 600 is mainly intended for longer-range flights of up to 770 miles. XTI believes it could fill several applications, including corporate transportation and emergency medical service.