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Boeing said it is reviewing the report and its recommendations.
Boeing believes the MAX will return to service in the fourth quarter of this year, but nevertheless set aside billion to cover costs arising from the plane being grounded. The three US airlines that fly MAX jets have cancelled flights using the plane through early January.

Biofertilizers are already a 20 billion yuan market in China and their usage could double by 2020, according to Chemlinked, a market research company that specializes in China's agrochemicals market.
Boeing 737 Max 8 jets, built for American Airlines, left, and Air Canada are parked at the airport adjacent to a Boeing Co production facility in Renton, Washington, the United States, April 8, 2019. [Photo/IC]
Biofuel usually refers to aviation fuel that is produced from renewable resources, including vegetable oils such as coconut oil, palm oil, jatropha oil and linseed oil, in addition to microalgae oil, waste cooking oil and animal fat. Compared with traditional petroleum-based aviation fuel, biofuel can help to reduce over 50 percent of carbon dioxide.
来源:资阳报