Like Rani said, B3 and other airlines need to incorporate economies of scale into their planning. Nigerian airlines however need to consolidate their services by mergers and acquisition in order to have the leverage to get the discounted deals from GECAS and others.
It is also high time Nigerian airlines seek technical partnerships from more established operators. Considering the high number of boeing aircraft in the country, there is no reason why a full service maintenance hangar can't be built that will effective serve the West African sub-region.