Vector<Flight*> * searchFlight(string destination)
{
    Vector<Flight*> *flights_to_dest = new Vector<Flight*>();
    for (int d = 0; d < n; d++)
    {
        if (destination == flights[d].destination)
        {
            flights_to_dest.push_back(flights[d]);
        }
    }
    return flights_to_dest ;
}