1. University of Žilina, Faculty of Operation and Economics of Transport and Communications, Department of Air Transport, Univerzitná 8215/1, 010 26 Žilina, Slovak Republic, jacob.sekera@gmail.com
2. University of Žilina, Faculty of Operation and Economics of Transport and Communications, Department of Air Transport, Univerzitná 8215/1, 010 26 Žilina, Slovak Republic, andrej.novak@fpedas.uniza.sk