Table 2 Sample characteristics

From: Customer satisfaction of Vietnam Airline domestic service quality

	N = 402	Frequency	Percentage
Gender	Male	193	48.0
Gender	Female	209	52.0
Age	From 18 to 33 years old	203	50.5
	≥ 34–46 years old	129	32.1
	≥ 47–60 years old	70	17.4
Income	≤ 5 million VND/month	84	20.9
	5–10 million VND/month	208	51.7
	≥ 10 million VND/month	110	27.4
Purpose	Business	125	31.1
	Conference	39	9.7
	Visiting relatives	91	22.6
	Tourism	113	28.1
	Other	34	8.5
Education	Secondary school	23	5.7
	High school	73	18.2
	Vocational	45	11.2
	College	38	9.5
	University	151	37.6
	Postgraduate	72	17.9

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