In July 2020, the Implementation Opinions of the Civil Aviation Administration on Supporting the Coordinated Development of Civil Aviation in the Guangdong-Hong Kong-Macao Greater Bay Area was promulgated, setting out the future development goals. In November of the same year, the Civil Aviation Administration of China issued the Four Characteristics Airport Development Guidelines, with “safe, green, smart and humanistic” as the core and fully integrated the philosophy of innovative, coordinated, green, open and shared development.