"Air Routes is a hierarchical classification of four levels. Level 1 of the classification has nine categories, Level 2 has 25 categories, Level 3 has 102 categories and Level 4 has 465 categories - excluding supplementary categories."
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| URI | http://bartoc.org/en/node/750 |
| Homepage | http://www.stats.govt.nz/methods/classifications-and-standards/classification-related-stats-standards/air-routes.aspx |
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