Reliable Robotics, a pioneering aviation startup working to transform the future of flight, has secured a significant financial boost to extend its operational runway. The Mountain View, California-based company has operated for nearly a decade with the ambitious goal of commercializing advanced autonomous flying technology designed to be retrofitted onto existing aircraft. With this fresh capital injection of $115 million, the company is better positioned than ever to push its cutting-edge autonomous flight system through the rigorous certification process overseen by the Federal Aviation Administration (FAA)—a critical, industry-defining milestone that leadership describes as drawing closer by the day.
The latest financing represents an extension of the startup’s Series D funding round. It is composed of $90 million in equity funding led by Nimble Partners, alongside $25 million in debt financing provided by Silicon Valley Bank. This capital push brings the total Series D round to an impressive $275 million, driving Reliable Robotics’ overall valuation comfortably past the coveted $1 billion mark and establishing it as a heavy hitter in the aviation technology sector.
Beyond Nimble Partners and Silicon Valley Bank, the startup’s funding round drew participation from a diverse group of investors, including Gideon Strategic Partners, RockCreek, Geek Ventures, Gold Hill Capital, and Sparkwave Capital, among others. With these funds successfully secured, Reliable Robotics has now raised a cumulative total of $380 million since its founding.
Robert Rose, the co-founder and CEO of Reliable Robotics, emphasized the methodical and consistent progress the company is making in an industry notoriously difficult to navigate. Rose brings an extensive engineering and leadership background to the venture, having previously served as the director of flight software at SpaceX alongside stints at Tesla and Google. Juerg Frefel, the company’s co-founder and chief technology officer, also boasts deep roots in the aerospace sector, having spent nearly a decade as an engineer at SpaceX.
"We continue to make steady progress and deliver evidence to the FAA and every day, we inch closer and closer," Rose stated, reflecting on the complex journey of bringing novel automation technology to commercial aviation.
In the world of aviation, which stands as one of the most heavily regulated industries on the globe, any forward momentum toward the certification of groundbreaking technology represents a monumental achievement. Reliable Robotics is currently pursuing FAA certification on four distinct fronts, each of which serves a vital role in the company’s overarching vision of fully realizing autonomous flight.
The company’s flagship product, known as continuous autopilot engagement, is designed to assist human pilots by managing some of the most complex and routine phases of a journey. The system handles engine startup, taxiing, takeoff, and landing. During these operations, the pilot remains physically inside the aircraft, maintaining oversight and interacting directly with the autonomous flight system through an intuitive touchscreen interface. Rose anticipates that the startup will secure certification for this foundational first system within the next 18 to 24 months.
The second major certification milestone tackles a more transformative phase of the technology. According to Rose, this phase is at least three years away and involves removing the pilot entirely from the cockpit, relocating them to a specialized ground-control station where they can monitor and manage flights remotely.
In tandem with its autopilot technology, Reliable Robotics is actively pursuing certification for an advanced collision-avoidance radar system. The company was forced to develop this critical hardware entirely in-house after struggling to attract legacy aerospace suppliers willing to take on the project. Traditional radar systems typically rely on physical antennas that constantly move to scan the surrounding airspace for potential hazards. In contrast, Reliable Robotics engineered a solid-state radar that features zero moving parts.
According to Rose, this innovative design scans the sky at significantly longer ranges and with vastly higher resolution than conventional equipment. Furthermore, the absence of moving parts makes the solid-state radar considerably easier to maintain over time while also reducing manufacturing and operational costs.
"This is of great interest to operators these days, given the collisions that we’ve had recently in commercial aviation," Rose noted, adding that the versatile radar also functions effectively while the aircraft is on the ground, helping prevent costly and dangerous collisions with other aircraft or airport infrastructure. Rose projects that the solid-state radar will successfully achieve FAA certification by the end of 2027.
The fourth and final regulatory hurdle involves the certification of the company’s very own airline, aptly named Reliable Airlines. Based in Albuquerque, New Mexico, the carrier will serve as the launch operator for the autonomous flying technology. Reliable Airlines currently operates a fleet of six Cessna Caravans—widely regarded as the dependable workhorses of the regional aviation industry—to fly cargo missions six days a week. While the FAA certifies aviation equipment and hardware separately, the agency also mandates a completely distinct and rigorous set of regulations for certifying commercial airline operations.
Navigating this multi-layered regulatory environment is undeniably time-consuming, but investors remain bullish on the long-term rewards. John Burbank, founder of Nimble Partners, emphasized that the impact of the startup’s technology will extend far beyond any single aircraft model.
"It’s a much bigger effort and much bigger opportunity than to just build one plane," Burbank said, highlighting the universal nature of Reliable Robotics’ platform, which is engineered to be seamlessly adopted by virtually any airframe. "They had a really big vision nine years ago, and saw this as something needed and essential. Once they get the first one approved, then everyone will realize this is going to be the path for the industry, just as we’re seeing the path for the auto industry being autonomous."