P3D United Airlines Boeing 737-600 NGXu - N943UA. United Airlines Boeing 737-600NG, registration N943UA. This repaint of early 90's United Airlines 737-500 N943UA for the PMDG 600NGXu is strictly freeware. Prepare3D v4+ with PMDG NGXu 8/900 base pack and 6/700 expansion pack required to use this file. Repaint by Latitude68. By Ryan Goebel.