American Airlines has entered a conditional purchase agreement with ZeroAvia, a clean aviation innovator, for 100 hydrogen-electric engines to power regional jet aircraft with zero inflight emissions except for water vapor. This agreement follows American's initial investment in ZeroAvia in 2022, with the engine deal reinforcing their commitment to sustainable air travel. ZeroAvia is developing hydrogen-electric engines for commercial aircraft, aiming for close to zero inflight emissions. The company is currently flight testing a prototype for a 20-seat plane and designing engines for larger aircraft like the Bombardier CRJ700. American's CEO, Robert Isom, highlighted the importance of investing in alternative propulsion technologies to transition to a low-carbon future in the aviation industry. This move supports American's ambitious target of achieving net-zero greenhouse gas emissions by 2050. The hydrogen-electric engines by ZeroAvia use hydrogen in fuel cells to generate electricity, powering the aircraft's electric motors and propellers. With only low-temperature water vapor as an inflight emission, these engines offer significant cost savings and sustainability benefits. The investment in ZeroAvia's innovative technology represents a step towards a cleaner future for commercial aviation, demonstrating American's commitment to environmental responsibility.