2. Complaints against the after-sales service department or ground crew of China Eastern Airlines: The handling unit is the customer service department of China Eastern Airlines, and it is filled in as "customer service department of China Eastern Airlines".
3. Complaining about the delay, cancellation or change of China Eastern Airlines flight: The handling unit is China Eastern Airlines Operation Control Center, and it is filled in as "China Eastern Airlines Operation Control Center".
4. Complaints about quality problems, product problems and price problems of China Eastern Airlines: The handling unit is the Quality Management Department of China Eastern Airlines, and it is filled in as "Quality Management Department of China Eastern Airlines".