def METHOD_NAME(self, n=1):
    ''' Append n elements (aircraft) to all lists and arrays. '''
    for v in self._LstVars:  # Lists (mostly used for strings)
        lst = self.__dict__.get(v)
        vartype = type(lst[0]).__name__ if lst else 'str'
        lst.extend([defaults.get(vartype)] * n)
    for v in self._ArrVars:  # Numpy array
        # Get type without byte length
        vartype = ''.join(c for c in str(self.__dict__[v].dtype) if c.isalpha())
        self.__dict__[v] = np.append(self.__dict__[v], [defaults.get(vartype, 0)] * n)