Joby Aviation, the S Four, and the FAA Certification Marathon That Will Determine Whether Electric Air Taxis Are Flying Passengers Before the Twenty Twenty-Eight Los Angeles Olympics

Joby Aviation’s S4 electric aircraft is currently the furthest along in FAA certification of any eVTOL vehicle in the United States, with over 1,000 test flights completed and a production-conforming aircraft flying. The company is targeting commercial passenger operations ahead of the 2028 Los Angeles Olympics. Whether a full multi-vertiport network materializes in LA or Joby launches in a smaller market first depends less on the aircraft than on infrastructure, airspace policy, and community acceptance.

What Is the Joby S4?

The S4 is a six-rotor electric aircraft with a tilting-rotor design unlike anything currently in the FAA’s type certificate database. At takeoff, all six rotors tilt upward for vertical lift. As the aircraft gains airspeed, the nacelles rotate forward, the rotors become propellers, and the S4 transitions into fixed-wing cruise flight. Some rotors then fold flat to reduce drag.

Cruise speed is approximately 200 miles per hour with a range of roughly 150 miles. That range covers downtown-to-airport corridors and city-to-city routes in metro areas like Los Angeles to San Diego. The S4 is a regional urban shuttle, not a cross-country aircraft.

The S4 runs entirely on lithium-ion battery power. Its performance figures represent what current battery energy density allows when paired with a carefully optimized airframe - not a bet on future breakthroughs. That is simultaneously the design’s strength and its ceiling.

How Quiet Is the S4?

Joby claims the S4 is approximately 100 times quieter than a conventional helicopter performing the same mission profile. The physics support the direction of that claim. Rotor noise scales sharply with blade tip speed, and distributed electric propulsion - six smaller rotors spinning more slowly - produces significantly less acoustic energy than a single large rotor spinning fast. Electric motors also allow precise, independent speed control across all six rotors.

Joby conducted noise testing at Hillview Airport in California with local residents and officials present. At cruise altitude, the aircraft was reportedly difficult to hear against ambient background noise. Takeoff and landing noise near vertiports remains less publicly documented and is the more critical measurement for urban siting decisions.

Where Does the S4 Stand in FAA Certification?

The FAA has no off-the-shelf regulatory category for the S4. It is not a Part 23 airplane, not a helicopter, and not a powered-lift aircraft under the existing regulatory definition - though the agency has been adapting the powered-lift category specifically for vehicles like this one.

Joby began formal certification work with the FAA in 2017, starting with G-1 issue papers - the foundational document where manufacturer and regulator agree on what standards apply and how compliance will be demonstrated. Completing the G-1 process meant the FAA formally accepted the S4 as a certifiable product and established the ground rules for everything that followed.

Joby has since completed over 1,000 test flights and has a production-conforming aircraft flying. “Conforming” means built to the exact specifications, drawings, and manufacturing processes of the production aircraft - a critical legal and technical threshold. No final certification testing can be completed on a prototype that differs from the production design. This milestone puts Joby further along in FAA certification than any other eVTOL developer in the United States.

The remaining work includes intentional motor-shutdown testing in flight. The aircraft must demonstrate it can survive those failures and land safely. Completing that testing with the conforming aircraft is part of the final push toward type certification.

How Safe Is a Six-Motor Electric Aircraft?

The S4’s safety architecture differs fundamentally from conventional aircraft. A traditional piston or turbine aircraft has one engine with backup systems. The S4 has six independent electric motors, six independent rotors, and a battery system with multiple redundant power strings. If one motor fails, the flight control computer redistributes power across the remaining five in real time. The aircraft is designed to land safely after losing any single component - and in some failure scenarios, multiple components simultaneously.

This distributed redundancy is the core engineering argument for electric propulsion over dense urban areas. Many independent systems that can each fail gracefully may produce better aggregate safety outcomes than a single highly reliable system with no fallback. The certification test program will generate the data to evaluate that argument directly.

Who Has Invested in Joby Aviation?

Toyota has invested approximately $600 million and is actively working with Joby on manufacturing scale-up. Toyota’s contribution extends beyond capital - their expertise in producing complex products efficiently at high volume is what Joby needs to move from enormous prototype costs to a price point viable for ordinary commuters.

Delta Air Lines has invested $60 million and has an agreement to integrate Joby operations into Delta’s airport infrastructure. When Joby launches commercial service, Delta customers may be able to book a vertiport-to-terminal leg as a single itinerary, checking in through Delta’s systems.

Joby went public via SPAC in 2021 at a valuation of approximately $5 billion. The stock subsequently followed the same arc as most eVTOL companies: an initial jump on the public listing, then a sustained decline as investors recalibrated timelines to match regulatory reality.

Who Are Joby’s Competitors?

Within the United States, Archer Aviation is the closest competitor by FAA certification progress. Archer’s Midnight aircraft uses a different configuration - 12 propellers in a stacked layout for hover, with separate propellers for forward flight. Archer has a commercial partnership with United Airlines for airport shuttle operations.

The furthest along globally is EHang, a Chinese eVTOL manufacturer that received type certification from China’s Civil Aviation Administration in April 2023 for a two-passenger autonomous aircraft. EHang has completed commercial passenger flights in China under remote supervision, with no pilot on board. The CAAC moved faster than the FAA in part because different standards applied and the operational environment differs significantly.

The EHang precedent matters for one reason: it demonstrates that the core engineering challenges of building and flying these aircraft are largely solved. What remains everywhere is certification standards, infrastructure, and community acceptance.

Will Joby Be Flying Passengers Before the 2028 Olympics?

Commercial passenger operations somewhere in the United States before the 2028 Los Angeles Olympics appear likely based on current certification progress. A functioning multi-vertiport network serving Olympic venues in Los Angeles specifically is considerably less certain.

The aircraft certification is on track. The infrastructure is not, at least not at Olympic scale in one of the most complicated cities in the country. A vertiport is not just a landing pad - it requires electrical infrastructure capable of fast-charging multiple aircraft on tight turnaround schedules, utility coordination, building permits, structural assessments, and zoning approvals. The airspace integration framework for managing dozens of eVTOL aircraft simultaneously in Class Bravo airspace around a major airport is still being developed through programs like NASA’s Advanced Air Mobility National Campaign.

Joby’s target price is $3 to $4 per mile - roughly $60 to $80 for a Los Angeles airport run, comparable to a premium rideshare. Hitting that price at launch with a small initial fleet and unproven infrastructure is uncertain. Early operations will almost certainly carry a premium while the company works toward scale. Every major network transportation business in history - railroads, airlines, rideshare - lost money in early operations before unit economics worked.

What This Means for Pilots

Three developments are worth watching directly.

Airspace. eVTOL commercial operations will place these aircraft in the same low-altitude urban airspace that general aviation uses today. The protocols for sharing that space between conventional GA traffic and electric air taxis are still being written. Pilots flying near urban vertiports will encounter a traffic picture unlike anything in the current environment.

Pilot certification. The FAA’s powered-lift commercial pilot certificate, created through 2024 rulemaking, defines who operates these vehicles. These are highly automated systems; the pilot role resembles system management more than hand-flying. What that means for airmanship development and aviation culture over time is a question worth following closely.

The economics. Whether Joby’s business model reaches long-term viability depends on patient capital and successful infrastructure deployment. The history of transportation networks suggests it is achievable. The timeline remains genuinely uncertain.

Key Takeaways

Joby Aviation’s S4 is the furthest along in FAA certification of any eVTOL in the United States, with over 1,000 test flights and a production-conforming aircraft flying.
The S4 cruises at approximately 200 mph over a 150-mile range on battery power, designed for urban and regional corridors.
Toyota ($600M) and Delta ($60M) are the marquee investors, bringing manufacturing scale and airport integration alongside capital.
Joby is likely to launch commercial service somewhere in the U.S. before the 2028 Olympics; a full LA vertiport network serving Olympic venues is less certain.
The remaining challenges are not engineering - they are infrastructure permitting, airspace policy, real estate, and community acceptance.