China may lift the ban on B737 MAX aircraft if certain conditions are met.

According to the Reuters report China’s aviation regulator has told airlines that design changes proposed by Boeing Co (BA.N) for its 737 MAX plane could resolve safety issues, indicating that the country is getting closer to lifting a more than two-year flight ban.

According to an undated notice obtained by Reuters, the Civil Aviation Administration of China (CAAC) has invited airlines to provide feedback on a proposed airworthiness directive for the 737 MAX by Nov. 26.

The directive specifies specific procedures for pilots to follow in the event of problems similar to those discovered in two fatal crashes prior to the plane’s grounding in March 2019. It also lists all of the systems that must be operational for the plane to be dispatched.

According to the aerospace behemoth, the 737 MAX successfully completed a test flight for CAAC in August.

Boeing CEO David Calhoun stated last month that the company was working to obtain Chinese approvals for the 737 MAX to fly by the end of the year, with deliveries expected to resume in the first quarter of 2022.

According to Boeing, roughly one-third of the approximately 370 undeliverable 737 MAX planes in storage are for Chinese customers.

Before the 737 MAX was grounded, Boeing sold one-quarter of its planes to Chinese buyers, its largest customer.

Other Asia-Pacific nations, including Singapore, Malaysia, India, Japan, Australia, and Fiji, have already approved the 737 MAX’s return.

Aside from safety concerns, Boeing’s sales in China have been hampered by trade tensions between the United States and China, with Washington accusing Beijing of preventing domestic airlines from purchasing Boeing planes.