1Time would be better off by stopping domestic flights altogether - they simply can't compete with kulula and Mango's -800's. They have to go regional to survive.
Use the MD's on regional flights to airports SAA doesn't serve - a la Interair - Interair have been raking it in for years flying to cities which weren't well served. They did a JNB - Brazza - Pt Noire - Douala - Cotonou / nightstop / then return for years, the B732s earned them lots of money. Now SAA have woken up and are servicing those cities, but 1Time should go after the others like Bangui, Ndjemena, Bujumbura, Kigali, Yaounde, Moroni, Tana, etc