American Airlines has agreed to a conditional purchase of 100 hydrogen-electric engines from ZeroAvia, according to the companies’ July 2, 2024 announcement. That is a purchase agreement, not confirmation that the engines have been delivered, certified, or put into airline service. It advances a relationship that began with an investment and an opportunity to order engines in 2022.
What American Airlines agreed to buy
The July 2024 agreement covers 100 hydrogen-electric engines intended for regional aircraft. American also said it increased its investment in ZeroAvia and participated in the startup’s Series C financing round. The companies described the engine purchase as conditional; their announcement does not establish that the conditions have been met or that any engines have been delivered. American Airlines’ July 2, 2024 announcement
How the deal differs from the 2022 announcement
The 100-engine agreement is a later step in a multi-year relationship, not a report of 100 completed deliveries.
| Date | What the companies announced | What it establishes |
|---|---|---|
| August 3, 2022 | American announced an investment and a memorandum of understanding giving it the opportunity to order up to 100 engines. | An order opportunity, not a purchase of 100 delivered engines. American’s 2022 announcement |
| July 2, 2024 | American announced a conditional purchase agreement for 100 engines and an increased investment. | A conditional agreement to buy 100, not evidence of delivery or entry into service. American Airlines’ 2024 announcement |
In 2022, American said the ZA2000-RJ powertrain was anticipated to enable regional-jet passenger flights as early as the late 2020s. That was a forecast at the time, not confirmation of a current service schedule. American’s 2022 announcement
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- The Hydrogen fuel trolley uses zinc particles and food grade citric acid to synthesize hydrogen, and then uses the produced hydrogen and air to generate electricity to drive the trolley.
- During the experiment, please use 80℃ hot water for Combination reaction (if the water temperature is low, the amount of hydrogen and air pressure from the Combination reaction are insufficient, the fuel cell cannot be used for power generation), and then take off the plug of the vent pipe at the lower part of the fuel cell, release the gas in the rubber hose immediately, and then plug it back immediately, so that only pure hydrogen and air are in the fuel cell, so that the fuel cell can generate hydrogen air power.
What “hydrogen-electric” means—and what it does not promise
ZeroAvia’s program uses hydrogen fuel cells to power an electric propulsion system. In American’s account, the engines have the potential for close to zero inflight emissions, with water vapor as the inflight emission. That describes emissions during flight; it does not establish zero emissions over the full lifecycle, including hydrogen production and transport. Nor does the announcement provide a basis for claims about operating costs, range, or commercial performance. American Airlines’ July 2024 announcement
Which aircraft could use the engines?
American said the engines are intended for regional aircraft. It named the Bombardier CRJ700 as an example of a larger aircraft for which ZeroAvia was designing an engine. The announcement does not say that American had begun converting CRJ700s. ZeroAvia’s July 2, 2024 announcement
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- The Hydrogen fuel trolley uses zinc particles and food grade citric acid to synthesize hydrogen, and then uses the produced hydrogen and air to generate electricity to drive the trolley.
- During the experiment, please use 80 ℃ hot water for Combination reaction
- And then take off the plug of the vent pipe at the lower part of the fuel cell, release the gas in the rubber hose immediately, and then plug it back immediately, so that only pure hydrogen and air are in the fuel cell, so that the fuel cell can generate hydrogen air power.
American’s July 2024 release also said ZeroAvia was flight-testing a prototype for a 20-seat aircraft while designing a larger engine. This is a dated description of development status at the time of that announcement, not proof of the program’s status in 2026. American Airlines’ July 2024 announcement
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are the engines certified or carrying passengers?
The announcements establish a conditional purchase agreement and describe development activity as of July 2024. They do not establish that the engines are certified, that the agreement’s conditions have been met, or that an engine has entered passenger service. No newer information here resolves whether any of those milestones occurred after the announcement.
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American CEO Robert Isom framed the investment as part of the airline’s technology strategy: “Advancing the transition of commercial aviation to a low-carbon future requires investments in promising technologies, including alternate forms of propulsion,” he said. This is the company’s rationale for investing, not an independently verified result about emissions or readiness.
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