Table 3.

The differences before and during the COVID-19 outbreak in each cluster.

Cluster No.	Flow Characteristics	Ratio Before	Ratio During	Number of OD Flow			Number of Passengers
				Before	During	Percentage of reduction	Before	During	Percentage of reduction
1	Domestic (outside China), short flight distance	31.17%	43.35%	738	727	1.50%	8,130,211	3,255,994	60.00%
2	Domestic (outside China), medium flight distance	4.86%	5.25%	115	88	23.50%	566,166	225,455	60.20%
3	Domestic (outside China), long flight distance	0.42%	0.48%	10	8	20.00%	9,277	3,035	67.30%
4	International, short, origin not from China, destination not to China	6.42%	4.89%	152	82	46.10%	2,313,504	160,189	93.10%
5	International, medium/long, origin not from China, destination not to China	5.91%	3.58%	140	60	57.10%	1,776,739	71,370	96.00%
6	International, short, originate from China	2.15%	0.95%	51	16	68.60%	656,467	17,567	97.30%
7	International, medium/long, originate from China	1.73%	0.78%	41	13	68.30%	466,780	7,387	98.40%
8	International, short, destination to China	9.92%	3.22%	235	54	77.00%	1,435,411	36,213	97.50%
9	International, medium and long, destination to China	8.02%	1.97%	190	33	82.60%	820,983	20,273	97.50%
10	China domestic, short flight distance	19.97%	24.21%	473	406	14.20%	7,024,330	2,096,954	70.10%
11	China domestic, medium, and long flight distance	9.42%	11.33%	223	190	14.80%	3,049,326	762,235	75.00%