Presentation of 2021 Air Transport statistical results
General Note.— The statistical data for 2021 appearing in this Report are to be considered as preliminary. Experience shows that the margin of error for world totals is probably less than 2 per cent, except in the case of financial data where it may be considerably higher. Unless otherwise noted:
| a) | all statistical data are applicable to ICAO Member States; |
| b) | traffic statistics are for revenue scheduled services; |
| c) | the expression “tonne-kilometre” means metric tonne-kilometre; |
| d) | total airline financial statistics relate to scheduled as well as non-scheduled services of scheduled airlines. |