The E190 is on dry lease to Fastjet from Bulgaria Air. FJ will shortly be brining in another leased A319.
The problem with ATCL is that their fares are too high compared with Precision and FJ, though they have said they'll bring them down - maybe because 2 other new airlines are soon going to start scheduled services from Dar.
ATCL are probably going to be buying a couple of CS3000 to start operating in 2018.