Those in Nigeria may well have a better answer, but from my information from handling agents, after a recent very busy Hajj period, IRS is headed into the tank, slowly slowly.
The same can be said more or less about Kabo, they are down to three 747's and a Nigerian CAA inspector told me that they might have to ground all three of those.
One airline that may well make a presence shortly is Mangal.
The managing director, whom I met on one of my flights, has big plans, and funding to back it up, it appears. They have called me repeatedly to look for airplanes...so we'll see.