As per ESG Today, American Airlines also increased the investments in ZeroAvia through participating in the startup's Series C financing round after an initial funding round in 2022. As sustainable aviation fuels have been regarded one of the fastest and most readily-available solutions for decarbonizing aviation, hydrogen engines could be the even better alternative, as they release no emissions at all in flight.

ZeroAvia is a California-based startup that develops hydrogen electric engines for commercial aircraft, which only release low-temperature water vapors in flight, offering cost savings, as well as emission cuts.

Experts at ZeroAvia expect to be able to deliver hydrogen engines for aircraft with capacities from 9 to 19 passengers capable of 480 kilometers of range by 2025 and up to 1.100 kilometers for 40-80 seat planes by 2027.

Currently, the company is testing a prototype engine designed for 20 seat aircraft, while working on a new design for the Bombardier CRJ700, which American Airlines operates on regional flights. The Bombardier CRJ700 is a small twin-engine jet aircraft that can carry between 66 and 78 passengers, depending on the configuration and it is operated for regional flights due to its range of 1.800 kilometers.

ZeroAvia Founder and CEO Val Miftakhov said that "American is supporting our mission of innovation for clean aircraft propulsion and it is a good signal that ZeroAvia is delivering on our technology roadmap. The solutions that can serve the largest airlines are within reach, and the clean future of flight is coming."

The US-based airline plans to go net-zero by 2050 and in recent years, it made significant efforts to improve its fleet of planes towards this objective.