Relating to South African Airports:

We only have listed on FR24: OR Tambo (Johannesburg), King Shaka (Durban), Cape Town, Port Elizabeth.

Missing: What about Lanseria (which is also an International with many ADS-B enabled flights)?
Bloemfontein is also an International, but I haven't seen an ADS-B flight there yet, Kimberley does have a few ADS-B enabled (both in my coverage area). Upington has a feeder to FR24, ADS-B enabled flights but is not listed as an airport on here.

Are airports selected by some criteria, or traffic volumes or something? Or just a lack of info perhaps?