Calculation and Influencing Factors of the Operating Efficiency of Chinese Airports under High-Quality Development

Table 7

Chinese airport high-quality development indicator system.

Item	Name of the explained variable	Abbreviation	Indicator and its unit
Green	Investment in energy conservation and emission reduction	LN(EC)	Input expenses of energy conservation and emission reduction (10,000 yuan)
	CO2 emissions per capita	LN(CE)	CO2 emissions per capita(ton)
Smart	Collaborative and intelligent operation efficiency of the airport	OTP	On-time departure rate (%)
		LN(DT)	Average delay time of departure (min)
Humane	Airport service	LN(SQ)	Airport service quality score
		CR	Airport complaint rate (%)
Safe	Operational safety	MA	Major accident rate for per million flights (%)
		LN(TAS)	Transportation incident rate for per million flights (%)
	Air defense security	LN(ADA)	Number of air defense security accidents investigated and handled (case)