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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]

Boeing had hoped the plane would be cleared to return to service this month, but that proved unrealistic, and it now appears the plane won't return to the sky until perhaps March at the earliest. The FAA said it plans to check all grounded planes, and the entire US fleet of MAX jets may not return to service until 2021.

Blockchains are kept in "peer-to-peer" networks that are continually updated and kept in synchronization. It would require huge amounts of computing power to access every instance of a certain blockchain and alter all its blocks at the same time. A network of tech-savvy users known as miners pour their computing power into maintaining the blockchain and verifying its transactions, ensuring that someone cannot spend the same coin again after paying for something with it.

Bolsonaro, who is scheduled to take office in January, said his government will actively seek to broaden and expand ties of cooperation with China, and will strengthen the bilateral relationship.

Both companies vow to continue expanding their networks for clean energy and to expand inter-provincial trading of new energy this year, stepping up efforts to reduce the country's reliance on fossil fuels and meet its booming power demand.