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 == Number= in Airlines & Destinations table == 

 What is the purpose of ""Number="" (e.g. 1=, 2=, 3= or 17=, 18=, 19=) within the rows of the airlines & destinations table in this article and a few others? It made alpabetizing a row difficult. Is it some artifact of VisualEditor, or was it meant to facilitate something?   "