private void AddFlight_Click(object sender, RoutedEventArgs e)
{
string departurepoint = Departure_TextBox.Text;
string destinationpoint = Destination_Textbox.Text;
string departuredate = Date_Textbox.Text;
string departuretime = Time_TextBox.Text;
string planeId = PlaneID_TextBox.Text;
Administrator.AddFlight(departurepoint, destinationpoint, departuretime, departuredate, planeId);
MessageBox.Show("Рейс добавлен");
}
