For flights from Lagos to Owerri, United Nigeria Airlines, ValueJet, and Aero Contractors all operate out of MMA2, the modern domestic terminal in Ikeja. Air Peace and Green Africa Airways depart from GAT (MMA1) instead — Air Peace specifically uses the Zulu hall. Arrive at least 90 minutes before departure. Here’s a table showing all the airlines departing from Lagos to Owerri and the terminals they take off from according to research from Flightpadi.