Core Viewpoint - The successful completion of the 7A inspection for the C919 aircraft by Eastern Airlines in Chengdu marks a significant milestone in the operational capabilities of the domestic aircraft in the southwestern region of China [1][3]. Group 1: Inspection and Maintenance - The C919 aircraft requires periodic inspections, including pre-flight, post-flight, weekly checks, A checks, C checks, and major overhauls, similar to automotive maintenance [3]. - The A check for the C919 is performed every 700 flight hours, 500 flight cycles, or every 4 months, following a first-come, first-served principle [3]. - The 7A inspection is a more intensive and labor-intensive deep check within the A check category, involving 151 work orders, including 93 routine checks and 58 additional tasks, covering critical systems such as airframe, engines, landing gear, flight control, and hydraulic systems [3]. Group 2: Operational Deployment - Currently, Eastern Airlines operates 11 C919 aircraft, which are actively engaged in commercial operations during the summer season, covering 14 premium routes connecting 12 cities [5]. - Since the launch of the Chengdu-Shanghai route in May 2023, the C919 has completed over 4,900 round trips, transporting over 650,000 passengers [8].