Core Viewpoint - Japan Airlines experienced an emergency situation where a flight rapidly descended approximately 8,700 meters due to a malfunction in the cabin pressure system, leading to a diversion to Kansai International Airport and subsequent apologies from the airline [1]. Group 1: Incident Details - On June 30, a Japan Spring Airlines flight from Shanghai to Tokyo encountered a fault about one hour after takeoff, resulting in a rapid descent from 38,650 feet to 10,000 feet, totaling a drop of 28,650 feet (approximately 8,700 meters) [1]. - The flight was operated by a Boeing 737-800, registered as JA-06GR, which is 8 years old [1]. - The emergency descent lasted about 9 minutes, with the maximum descent rate reaching 4,500 feet (1,400 meters) per minute, which is considered normal for emergency procedures [1]. Group 2: Safety Procedures - The captain explained that the standard emergency procedure requires descending to a safe altitude of around 10,000 feet (3,000 meters) to ensure passenger safety, as any delay could pose a threat to life [1]. - The aircraft's pressurization system is crucial for maintaining adequate air pressure and temperature for passenger comfort at cruising altitudes between 30,000 feet (9,000 meters) and 40,000 feet (12,000 meters) [1]. - In the event of a pressurization failure, pilots must act quickly to descend to a safe altitude, typically around 3,000 meters, to ensure breathable air for passengers [1].