If I want to destroy a building that is in the left side closer to the border, the airplanes will came from the left. That make me think that the airplanes will always appear from the closest area where the building (I want to destroy) is. But sometimes I want to destroy a building that is closer to a specific area, The airplanes appear from other area that is very far. Also using the 4 airplanes at the same time to destroy One specific building, the airplanes appear from different areas. This is important specially for World Wars because my airplanes are getting destroyed by flying over areas that arent supposed to. Is an error of the game or there is any rule for the airplanes that I dont know?