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Boeing has temporarily halted test flights of its new 737 MAX aircraft due to possible issues with the engine, the BBC reports.
The stoppage came days before the US planemaker was due to make its first delivery of the aircraft to a customer.
But Boeing said it was sticking with plans to begin MAX deliveries this month, adding that production of the jets would continue.
American Airlines, Southwest, and China’s Shandong Airlines are among those who have placed orders.
The MAX fleet is designed to be a more fuel-efficient version and replaces Boeing’s previous 737 model which has been a best-seller for the aerospace giant.