OK, maybe we are talking at cross-purposes.
Starting salaries are one thing. At all the airlines you will probably not clear R20K when you start (although you would be very close if you have an ATP and include flight pay). But we are talking about jet FO salaries in general. I have access to the scales of various airlines (excluding 1Time), and I can vouch that at three of the airlines in SA, FO's can take home more than R20k per month.
In fact, if you have an ATP, you will take home >R20k/month within 3 years of joining at all three.