function update(Airline $airline)
 {
     Diff::compare($airline, Input::all(), function ($key, $value, $airline) {
         $change = new AirlineChange();
         $change->airline_id = $airline->id;
         $change->user_id = Auth::id();
         $change->key = $key;
         $change->value = $value;
         $change->save();
     });
     Messages::success('Thank you for your submission. We will be evaluating your feedback soon.');
     return Redirect::route('airline.show', $airline->icao);
 }