1. Infrastructure maintenance: The airline infrastructure department is responsible for maintaining the airport and its facilities, including the runway, apron, terminal building, baggage transfer system, etc. These facilities often need regular overhaul and maintenance, and sometimes they need maintenance after the airport is closed, so the staff of the infrastructure department need to work overtime.
2. Emergency treatment: The airline infrastructure office needs to respond to emergencies at any time, such as facility failures and natural disasters, and needs to respond and deal with them in time. These situations may need to be handled during abnormal working hours, so the staff of the capital construction department need to work overtime.