Air China has signed a $6 billion deal with Boeing for 60 B-737 aircraft.

They will be delivered between 2016 and 2020, according to a regulatory filing by the airline.

China’s national airline said the deal includes Next-Generation 737 and 737 MAX aircraft.

“We are excited to see that the 737 family will play a significant role in Air China’s continued success,” said Ihssane Mounir, Boeing’s Northeast Asia vice president of sales and marketing in a statement.

In September Boeing said China would need more than 6,020 aircraft over the next 20 years as the country’s travel market starts to recover.

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