ostream& operator<< (ostream& os, const AirborneLocation& plane){ os << plane.name << ":" << endl; os << "\tPlane's ID: " << plane.ID << endl; os << "\tPlane's Class: "; if (plane.plane_class == 'C') os << "Civilian"; else os << "Military"; os << endl; os << "\tPlane's Location: "; if (plane.coord_x < 0.0) os << abs(plane.coord_x) << " km west, "; else os ...