Core Viewpoint - A China International Airlines flight (CA139) from Hangzhou to Seoul made an emergency landing in Shanghai due to a lithium battery catching fire in the overhead compartment, with no injuries reported [1]. Group 1: Incident Details - On October 18, a passenger's lithium battery in their carry-on luggage ignited during the flight, prompting the crew to take immediate action and divert the flight to Shanghai Pudong International Airport [1]. - The airline confirmed that the incident was handled according to protocol, ensuring the safety of all passengers on board [1]. Group 2: Regulatory Context - Since June 28, the Civil Aviation Administration of China has implemented new regulations prohibiting passengers from carrying unapproved lithium batteries on domestic flights, but these regulations do not apply to international flights [1].