Stella Qiu and Yew Lun Tian

BEIJING, (Reuters) – China’s aviation regulator said that it was satisfied with the design modifications Boeing (NYSE) Co suggested for its 737 MAX aircraft could solve safety issues. This is a signal it is getting closer to lifting a Chinese flight ban of more than two years.

According to an undated notice by Reuters, the Civil Aviation Administration of China invited airlines to provide feedback about a proposed Airworthiness Directive for the 737 MAX. This directive was due to be published by November 26, according to Reuters.

This directive provides specific instructions for pilots on how to handle problems that could have been caused by the two fatal crashes of March 2019, which led to the grounding. The directive also lists the system requirements to enable the plane’s dispatch.

Boeing will be greatly benefited by China’s return to the skies. China is the world’s largest aircraft market. According to Broker Jefferies, announcing the announcement in September would bring a 5% increase in stock prices.

Last year, the United States and Europe sought feedback from the industry on other proposed directives. Then they approved the return of the 737 MAX.

CAAC noted that after reviewing all the proposed changes by Boeing and including the design of the display system for aviation control software, the agency concluded the changes would eliminate unsafe conditions that could have led to crashes.

A request to comment was not immediately received by the agency. Boeing spokesmen stated that they continue to collaborate with regulators worldwide to restore the 737 MAX into service.

Aerospace giant Boeing has confirmed that the 737 MAX successfully flew a test flight to CAAC’s satisfaction in August.

Boeing’s Chief Executive David Calhoun indicated last month that they were working towards obtaining Chinese approvals before the end of this year to allow the 737 MAX for flying. Delivery is expected to resume in 2022.

Boeing stated last month that around a third (370) of the 737 MAX planes still undeliverable are in storage for Chinese customers.

Boeing had been selling 25% of the planes that it made annually, before the 737 MAX went down, to Chinese buyers.

The 737 MAX has been approved by other countries of Asia, such as Singapore, Malaysia and India.

Boeing’s China sales have been hampered by U.S. trade tensions. Washington accused Beijing of blocking Boeing planes being purchased by its domestic airlines.