航班起飞40分钟后返航换飞机，国航客服：系航司原因

Core Points - On November 7, a flight from Beijing to Guangzhou (CA1339) returned to Beijing after takeoff, flying at an altitude of approximately 9,000 meters before descending [1] - The flight took off again after approximately 2 hours and 30 minutes of ground time, with a change to another aircraft, an Airbus A330-343X [1] - The reason for the return was attributed to the airline's internal issues, with no further details available from the airline's customer service [1]