9 | Maintenance expenses |
2017 | 2016 | 2015 | ||||||||||
RMB million | RMB million | RMB million | ||||||||||
Aviation repair and maintenance charges |
7,930 | 7,952 | 7,396 | |||||||||
Staff payroll and welfare |
2,620 | 2,363 | 2,131 | |||||||||
Maintenance materials |
1,327 | 1,003 | 880 | |||||||||
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11,877 | 11,318 | 10,407 | ||||||||||
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