[redhead]

Your class needs an assignment operator ie = it can be accomplished like so:

class Avion{
  private: 
    std::string name;
    int number;
    std::vector <double> some_vector;
...
  public:
    Avion operator=(Avion a){
      name = a.name;
      number = a.number;
      some_vector = a.some_vector;
      return *this;
    };
...
}

Or however it will fit to reassign every member from your class to the current class instance..