Promotion and selling expenses (Tables)

12 Months Ended

Dec. 31, 2019

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Summary of Promotion and Selling Expenses

	2019		2018		2017
	RMB million		RMB million		RMB million
Ticket office expenses		3,299		3,173		3,160
Sales commissions (Note)		2,214		2,027		1,935
Computer reservation services		959		892		835
Advertising and promotion		314		217		196
Others		969		727		755
		7,755		7,036		6,881

Note: The Group applies the practical expedient in IFRS 15 and therefore expenses the portion of sales commissions which are regarded as directly related incremental costs of obtaining transportation contracts, as the amortization period is less than one year.