Top (above) photograph “A United Airlines passenger airplane passes over Whittier, Calif., on its way to Los Angeles International Airport, Sunday, July 26, 2015. (AP Photo/Nick Ut)” was sourced from the Washington Post: https://www.washingtonpost.com/news/energy-environment/wp/2016/03/11/united-airlines-is-flying-on-biofuels-heres-why-thats-a-really-big-deal/
According to Energy.gov:
“The first United Airlines passenger flight to fly using 100% sustainable aviation fuel (SAF) departed today from Chicago O’Hare International Airport at 1 p.m. ET and will arrive at Ronald Reagan Washington National Airport at 4 p.m. ET. Research by the U.S. Department of Energy’s Bioenergy Technologies Office helped to develop the biofuel technology that powered this flight, and may power your own commercial flight some day. In fact, the goal is to have such fuels meet 100% of aviation fuel demand by 2050. Meeting this goal would be a monumental step in reducing global greenhouse gas emissions within the aviation industry.
The U.S. continues to lead in biofuel production. The biofuel industry has created 68,000 jobs, produced 17 billion gallons of fuel, and saved 544 million metric tons of CO2 from entering the atmosphere.”