Reliable Robotics Raises $160M to Fly Autonomous Cargo Without a Pilot in the Cockpit

The skies above Albuquerque, New Mexico could soon see something that has never happened in the United States before: a large-category cargo aircraft flying a commercial route, carrying paying freight, without a human in the cockpit.

Reliable Robotics, the Mountain View, California-based startup pursuing that milestone, announced on April 21 that it has raised $160 million in new funding led by Nimble Partners. The round, which values the company at nearly $1 billion, attracted a broad investor consortium including Eclipse, Lightspeed, Coatue, Pathbreaker Ventures, Island Green Capital, Socium Ventures (a Cox Enterprises subsidiary), AE Ventures (a strategic partner of Boeing), RTX Ventures, Presidio Ventures (Sumitomo Corporation), and UP.Partners, among others. The range and seniority of the investor group — spanning premier venture firms, defense conglomerates, and aerospace strategic partners — signals confidence in both the technology and the regulatory path.

The SpaceX Alumni Who Want to Automate the Skies

Reliable Robotics was founded by Robert Rose, who served as a flight software director at SpaceX and later as a senior director on Tesla Autopilot. His CTO is Juerg Frefel, a former SpaceX avionics lead. The founding team brought with them not only aerospace engineering expertise but a specific operational philosophy developed at SpaceX: that the fastest path to safety is rigorous, data-driven iteration against a clear certification framework.

That philosophy shapes how Reliable is approaching the Federal Aviation Administration. The company has spent years building what Rose describes as a “mountain of evidence” for an FAA certification of its Reliable Autonomy System (RAS) installed on a Cessna 208 Caravan — one of the most widely used cargo aircraft in regional aviation. The FAA has agreed to the certification basis and means of compliance, meaning the agency and the company are working from a shared technical framework. Reliable is now in what Rose calls “execution mode,” delivering compliance documentation on a daily basis according to the agreed plan.

The FAA type certificate Rose has publicly targeted for 2028 has slipped modestly to early 2029, a timeline adjustment that analysts have noted is modest by aerospace industry standards. The regulatory engagement itself is notable: the FAA’s willingness to define a certification basis for an uncrewed large-category aircraft represents a policy evolution that would have been difficult to imagine five years ago.

First Commercial Uncrewed Cargo in U.S. Airspace

The immediate operational milestone is more near-term than the type certificate. Reliable plans to fly its first paid commercial cargo revenue hop out of Albuquerque International Sunport before the end of summer 2026 — a flight that would be the first time a large-category uncrewed aircraft has moved paying freight in U.S.-controlled airspace.

The routes are defined: Albuquerque to Santa Fe Regional Airport and Durango-La Plata County Airport in Colorado. The company operates these routes through its FAA Part 135 subsidiary, Reliable Airlines, under a partnership with the City of Albuquerque within the FAA’s Advanced Air Mobility Integration Pilot Program. The program gives Reliable a city-backed regulatory slot that provides additional pathway for demonstrating compliance in operational conditions.

The significance of the Albuquerque corridor is strategic as well as logistical. The routes connect regional markets that are underserved by conventional cargo airlines, where the economics of a crewed cargo flight are difficult to justify. An autonomous cargo system can operate these routes with dramatically lower operating costs — no pilot salary, no crew rest requirements, no crew scheduling logistics — and at flight cadences that match demand rather than shift schedules.

200+ System Commitments and the Military Dimension

The commercial route program is running alongside a military dimension that adds another layer to the company’s near-term revenue picture. Reliable has secured a contract with the United States Air Force to provide automated air cargo operations, and has accumulated commitments for more than 200 systems across commercial and military customers. Given a target unit economics profile well below crewed alternatives, these commitments represent a potentially significant revenue pipeline once the RAS system achieves certification and scales production.

The military angle also connects to the company’s investor base in revealing ways. AE Ventures, affiliated with Boeing, and RTX Ventures, affiliated with Raytheon Technologies, are both investors. RTX’s Pratt & Whitney division manufactures the PT6A engine that powers the Cessna 208 Caravan. Boeing has existing relationships with the Air Force that touch cargo logistics. The investor composition suggests that strategic partners view Reliable not merely as a promising startup but as a potential component of their own aerospace automation roadmaps.

Why Aviation Automation Is Harder — and More Important — Than Ground Autonomy

Autonomous aviation faces a different risk calculus than autonomous ground vehicles. The consequences of a system failure at altitude are categorically more severe than a lane departure or intersection error. Redundancy requirements are more demanding. Certification standards, while still being developed for uncrewed aircraft, draw from a century of commercial aviation safety culture that takes single-point failures extraordinarily seriously.

Reliable’s engineering approach reflects these constraints. The RAS is designed around triple-redundant systems for critical functions, with real-time ground monitoring and the ability for ground operators to intervene or take supervisory control. The system does not operate in fully unsupervised conditions: a ground-based flight operations crew monitors each flight, though they are not directly piloting the aircraft. This architecture is a pragmatic acknowledgment that full autonomy and certificated autonomy are not the same thing, and that the latter is what enables commercial operations.

This distinction matters for the market opportunity. The roughly 5,000 commercial turboprop cargo aircraft operating in the United States today represent a first wave of addressable aircraft for a system like RAS — aircraft that fly predictable routes, in relatively controlled airspace corridors, with cargo that does not require in-flight passenger safety considerations. If Reliable can certify and deploy at scale in this category, the addressable market expansion path to larger regional aircraft is substantially de-risked.

A Bet That the Skies Are Next

The $160 million raise comes at a moment when autonomous systems have achieved considerable technical maturity in surface transportation — Waymo is scaling commercial operations, autonomous trucking platforms are moving freight on highways — but aviation has lagged. Reliable Robotics is making the case that aviation is not fundamentally different from ground autonomy in the ways that matter for commercialization, just harder and slower. The company’s SpaceX-derived culture of aggressive timeline compression through rigorous engineering, combined with a uniquely cooperative regulatory engagement, gives it a credible path to proving that thesis.

If the Albuquerque cargo hops fly this summer as planned, it will be a milestone not just for Reliable Robotics, but for the broader proposition that the last major transportation mode yet to be substantially automated is finally beginning its transformation.