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Boeing had hoped to have the plane back in the air by this summer, but that now appears unlikely.
Blockchain is a computer technology that composites distributed data storage, point-to-point transmissions, a consensus mechanism and encryption algorithm.
Boeing's orders for new planes fell to a 16-year low in 2019 after two crashes of the 737 MAX killed 346 people and led to the worldwide grounding of the plane, costing the company nearly billion and its title as the world's largest aircraft manufacturer.
Boeing said it has completed associated simulator testing and its engineering test flight and developed training and education materials that are now being reviewed by the FAA, global regulators and airline customers so that the jets can be returned to service.
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来源：资阳报