private function addNewFlights(Subscription $subs, $flights)
 {
     if ($flights != null) {
         foreach ($flights as $flight) {
             $subs_flight = new \SubsFlight();
             $subs_flight->ID_subscription = $subs->ID;
             $subs_flight->FlightXML = $flight;
             try {
                 if (!$subs_flight->save()) {
                     new \Error(5, null, json_encode($subs_flight->getErrors()));
                 }
             } catch (Exception $e) {
                 new \Error(5, null, $e->getMessage());
             }
         }
     }
 }