Gregory Polek has spent his entire career in aviation journalism with AIN, starting as a proofreader and assistant to then-managing editor Mary Mahoney in 1995 after serving an internship with&nbsp;New Jersey Monthly&nbsp;magazine and completing his B.A. degree in English/Writing at New Jersey’s William Paterson College. By 1997 Polek accepted a position as an associate editor, covering the regional airline beat for&nbsp;Aviation International News&nbsp;in place of retiring industry veteran Don Anderson. The assignment took Polek across North America and Europe to profile regional airlines varying in size and mission from the likes of floatplane operators Kenmore Air and Chalk’s Ocean Airways to regional jet operators such as SkyWest and American Eagle. Today, in his dual role as Air Transport Editor and International Airshow Editor, Polek writes, edits, and manages AIN’s commercial aviation content while overseeing each of the company’s daily international air show publications in Paris, Farnborough, Singapore, and Dubai. Most recently Polek has assumed oversight of daily coverage of the Helicopter Association International’s annual Heli-Expo convention.

Senior Editor

United Airlines today joined Alaska Airlines in committing to a new, $35 million round of capital investment in ZeroAvia's hydrogen-electric propulsion system, bringing total financing for the project to $115 million. The new equity stake for United gives the Chicago-based airline rights to buy up to 100 of the zero-emission ZA-2000RJ engines, which could power United Express regional jets by 2028. 
United specified 50-seat Bombardier CRJ550 regional jets&nbsp;as “one potential use” for the engine. Using the same airframe as the 70-seat CRJ700, the CRJ550 features a two-class cabin that holds 20 fewer passenger seats. United Express affiliate GoJet, which served as the CRJ550 program’s launch customer in 2019 has converted more than 50 of its CRJ700s to the 50-seat configuration. 
Bombardier has since ceased production of its regional airliner family and exited the commercial aviation sector. In June 2020, Mitsubishi Heavy Industries acquired the CRJ program and is now providing aftermarket support to some 1,300 of the twinjets in service worldwide. In October, the Japanese group's MHI RJ Aviation Group announced a planned partnership with ZeroAvia but declined to confirm whether this will involve it being involved in converting the CRJs to hydrogen power.&nbsp;
“Hydrogen-electric engines are one of the most promising paths to zero-emission air travel for smaller aircraft, and this investment will keep United out in front on this important emerging technology,” said United Airlines CEO Scott Kirby. “United continues to look for opportunities to not only advance our own sustainability initiatives but also identify and help technologies and solutions that the entire industry can adopt.”
Under the agreement with United Airlines Ventures, United will pursue a conditional purchase agreement for 50 ZeroAvia ZA2000-RJ engines and an option for 50 more, enough to power up to 50 twin-engine aircraft that one or more United Express partners would operate. 
ZeroAvia plans to soon begin ground tests of its smaller ZA600 engine in a 19-seat aircraft under a schedule that calls for entry into commercial service in 2024. It has now secured a pair of Dornier 228 twin-turboprop aircraft to use as testbeds for the&nbsp;600-kW hydrogen-fuel-cell-based powertrain and is preparing to start flight testing this in the UK.
The company has set an initial target for a 500-mile range in a 10- to 20-seat aircraft used for commercial passenger transport, package delivery, agriculture, among other uses. The latest funding round targets the next segment of 40- to 80-seat aircraft, including turboprops by 2026 and regional jets by 2028.&nbsp;
Larger airliners, like the CRJ family, are expected to need between 2MW and 5MW of power, which is why ZeroAvia is now working on the larger ZA2000-RJ powertrain. On these CRJ, this would replace the aircraft's existing GE Aviation CF-34 turbofans, with the conversion being covered by a supplemental type certificate under Part 33 rules.
Over the past few weeks, ZeroAvia has made significant progress towards achieving its goal of zero-emission aviation with commercial momentum through partnerships with Alaska Airlines, Rose Cay, Hindustan Aeronautics Limited, ASL Aviation Holdings, Mitsubishi Heavy Industries’ Regional Jet division, and Rotterdam the Hague Airport. 
Along with United and Alaska Airlines, other investors include Amazon’s Climate Pledge Fund, AP Ventures, Breakthrough Energy Ventures, Horizons Ventures, Summa Equity, and Shell Ventures. ZeroAvia is competing with fellow California-based start-up Universal Hydrogen, which has also secured significant funding for its plans to convert existing regional airliners, including the Dash 8 and the ATR42/72. Last week, U.S.-based Connect Airlines said it will convert up to 24 Dash 8-300 aircraft with Universal's technology.
In February, United Airlines and its regional affiliate Mesa signed an agreement with Archer to add its four-passenger eVTOL aircraft to its fleet. The carrier intends to use the vehicle to carry passengers to and from its major hub airports,in cities such as Los Angeles.

Gregory Polek

ZeroAvia hydrogen-electric propulsion system could power United Express CRJ550 regional aircraft by 2028. (Image: United Airlines)

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