I can't tell you how much this appeals to the Chinese in me. My mother would be proud of you!
If you have time to drill down to the Comair level, it seems to me that these routes might be regarded as green and red dots:-
Green from JNB
JNB-PLZ (564 miles)
JNB-VFA (574 miles)
JNB-LVI (593 miles)
JNB-MRU (1908 miles)
Red from JNB
JNB-WDH (724 miles)
JNB-CPT (790 miles)
Red from CPT
CPT-DUR (795 miles)
I think that these price according to the bands in the table, although I haven't checked all of them now.