Watch how aircraft engine maker Rolls-Royce tested an engine running on 100% sustainable fuel with a flight from Tucson International Airport. Video footage and photos courtesy of Rolls-Royce Holdings; additional photos courtesy of United Airlines and Airbus.
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For Star subscribers: Rolls-Royce flew a Boeing 747 test plane from Tucson International Airport with one engine fueled by low-carbon biofuel.
For Star subscribers: Here's how a dozen utility providers, including Tucson Electric, are working to lower customer costs, improve reliability.
For subscribers only: The mining company bought 20 acres in the Santa Ritas near Tucson from a foundation in Metallica lead singer James Hetfield's name.