Their appointments are for a period of four years, renewable for another four years in line with the recommendations of the Minister of Aviation. At the same time, the heads of the Nigeria Airspace Management Agency (NAMA) and the Nigerian Meteorological Agency (NIMET) were also appointed. However, the tenures of the CEOs of NIMET and NAMA are for five years in line with the provision of the acts establishing them. But for NCAT and AIB-N, they could be renewed for another four years subject to their satisfactory performance. Daily Trust learnt on Tuesday that the AIB-N head proceeded on terminal leave since December 2020 and handed over to the most senior director in the agency.