The 1 Metric That Separates Joby From Archer in the Race to FAA Certification

Joby Aviation trades at 51x projected 2026 sales versus Archer Aviation at 278x, reflecting Joby's substantially higher expected revenue of $119.5 million versus Archer's $15.1 million. Joby is also further along in FAA certification, having reached stage five of the five-stage process compared with Archer's completion of stage three. By 2028, Archer is forecast to generate $511.5 million in revenue versus Joby's $434.8 million, potentially making Archer cheaper on forward sales multiples, but the article favors Joby due to certification progress, aircraft efficiency, and its higher-margin vertically integrated model.

Analysis

The relevant valuation is not current sales multiples but the probability-adjusted value of certificated aircraft, production capacity, and route economics. JOBY’s certification lead deserves a premium because first commercial operations create the category’s first real utilization, maintenance, and insurance data; that evidence could lower financing costs for the entire sector. Its acquired aviation-services footprint also provides a bridge to operating know-how, but reported revenue should not be mistaken for validation of eVTOL unit economics.

ACHR’s apparent 2028 discount embeds a far more demanding industrial ramp: OEM economics require certification, supplier qualification, working capital, warranty reserves, and buyers able to finance fleets. That makes its forward-revenue estimate especially vulnerable to a one- to two-quarter delay in certification or manufacturing readiness. Conversely, if ACHR secures binding fleet deposits with credible financing and a defined production schedule, the stock has greater multiple-expansion torque than JOBY because expectations are currently more fragile.

Over the next 1-3 months, FAA stage milestones, aircraft conformity disclosures, and cash-burn guidance matter more than partnership announcements. Over 6-18 months, the key differentiator is whether TM-supported manufacturing can produce repeatable aircraft at acceptable cost; JOBY’s vertical model only earns a margin premium if load factors and turnaround times offset ownership and operating capital intensity. UBER is a low-beta optionality beneficiary, but eVTOL volumes will be immaterial to its earnings for years.

Contrarian view: certification is necessary but not sufficient. The first operator may discover that vertiport access, pilot rules, battery-cycle life, and insurance constrain utilization below underwriting assumptions, compressing the sector’s terminal revenue multiples even after an FAA win. A sustained risk-off move or higher long-end yields is a near-term threat because both equities remain long-duration cash-burn assets.

Key Decisions for Investors

• Maintain a modest long JOBY / short ACHR pair for the next 3-6 months, sized as a venture-style catalyst trade rather than a core holding. JOBY has the cleaner near-term de-risking path; exit or reverse if ACHR advances a certification stage ahead of expected timing or announces financed, binding production orders rather than nonbinding partnerships.
• Do not underwrite ACHR on 2028 revenue estimates until management discloses contracted customer economics, manufacturing capex, unit cost trajectory, and cash runway through initial scaled deliveries. Use any certification-stage headline rally without those data as a potential short-entry alert, not confirmation of the bull case.
• For JOBY longs, take partial profits following a major certification milestone unless accompanied by credible operating metrics: route access, insurance terms, expected utilization, and cash burn. Thesis is falsified by certification slippage, a material increase in annual cash use, or evidence that TM production support is not translating into cost-down progress.
• Treat TM and STLA exposure as indirect optionality only; eVTOL contribution is unlikely to affect consolidated earnings within 18 months. UBER can be monitored for network integration announcements, but it is not a clean vehicle for this catalyst.