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Boeing said shims, or material used to fill empty spaces between parts and align them, weren't correctly sized in the rear fuselage of the plane. A second issue involved a failure to meet "skin flatness specifications" in some parts of the assembled aircraft.

Boeing Max jets were grounded worldwide following two fatal crashes - one on Oct 29 last year in Indonesia and the other on March 10 in Ethiopia - that killed a total of 346 people.

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.

Billions of dollars set to flow into the country's stock market from Sept 2019

Both companies are expected to start operation within the year, Audi said.