Fuel

The revised plan is clearer about several important points, but many of the decisions still await testing and a second plan.

Investigators posing as pilots found required charges were frequently incomplete or inconsistent.

Infinium produced the fuel using waste carbon dioxide and renewable electricity.

The company plans to use the funding to develop a commercial demonstration plant targeted for 2028.

The roadmap retains the 2030 goal while leaving the detailed schedules for its national and Alaska phases unsettled.

The agency has not changed the 2030 target, though its deputy administrator described the current schedule as aggressive.

Evaluation will focus on higher-compression Continental and Lycoming engines.

Preliminary results indicate reduced particle emissions associated with contrail formation.

Walsh says SAF production and carbon-credit access remain key obstacles.

Researchers say announced projects face feedstock, policy and market hurdles.