The code scrapes the data from Wikipedia.
Specially the pages below:
https://en.wikipedia.org/wiki/List_of_airports_in_Alberta
https://en.wikipedia.org/wiki/List_of_airports_in_British_Columbia
https://en.wikipedia.org/wiki/List_of_airports_in_Manitoba
https://en.wikipedia.org/wiki/List_of_airports_in_New_Brunswick