Cache the api calls to vacentral and make the iata field optional

app/Http/Controllers/Api/AirportController.php

@@ -6,6 +6,7 @@ use App\Repositories\AirportRepository;
 use App\Http\Controllers\AppBaseController;
 use App\Http\Resources\Airport as AirportResource;
 
+use Illuminate\Support\Facades\Cache;
 use VaCentral\Airport as AirportLookup;
 
 class AirportController extends AppBaseController
@@ -25,7 +26,14 @@ class AirportController extends AppBaseController
      */
     public function lookup($id)
     {
-        $airport = AirportLookup::get($id);
+        $airport = Cache::remember(
+            config('cache.keys.AIRPORT_VACENTRAL_LOOKUP.key') . $id,
+            config('cache.keys.RANKS_PILOT_LIST.time'),
+            function () use ($id) {
+                return AirportLookup::get($id);
+            }
+        );
+
         return new AirportResource(collect($airport));
     }
 }