By Joanna Plucinska, Joe Brock, Marleen Kaesebier and Paul Carsten

PARAMOUNT, California (Reuters) -In 2019, Scott Kirby, the chief executive of United Airlines, hailed its new contract with green jet fuel producer World Energy as an example for the aviation industry to follow in its drive to cut emissions.

Six years later, that collaboration is dead.

Boston-based World Energy was one of the first companies in the world to produce commercial quantities of sustainable aviation fuel (SAF), a type of renewable fuel made from sources such as used cooking oil, agricultural residues and other waste.

Its Paramount refinery near downtown Los Angeles had been a rare success story, supplying millions of gallons of SAF a year to airlines such as United Airlines and fellow U.S. carrier JetBlue Air

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