Synergetic Development Measure of Airport Groups Composite System and Its Influencing Factors Analysis: Some Evidence from China

Table 1

Index of the Chengdu-Chongqing airport group composite system order parameter.

Composite system	Subsystem	Characteristics	Order parameters	Unit
Airport group composite system (S)	Airport development subsystem (S1)	Air transportation scale	Air passenger throughput (h11)	Person
			Air cargo throughput (h12)	ton
			Aircraft take-off and landing sorties (h13)	Sortie
		Operational capacity of the airport	The number of air routes (h14)	Strips
			The number of airlines (h15)	—
	Twin-city economic subsystem (S2)	Economic status	Urban GDP (h21)	Yuan
			Tertiary industry share (h22)	%
		Consumption level	Per capita disposable income (h23)	Yuan
			Resident population (h24)	Person