Laravel 9 Update (#1413)

Update to Laravel 9 and PHP 8+

Co-authored-by: B.Fatih KOZ <fatih.koz@gmail.com>

app/Services/ImportExport/AircraftExporter.php

@@ -31,12 +31,13 @@ class AircraftExporter extends ImportExport
     {
         $ret = [];
         foreach (self::$columns as $column) {
-            $ret[$column] = $aircraft->{$column};
+            if ($column === 'subfleet') {
+                $ret['subfleet'] = $aircraft->subfleet->type;
+            } else {
+                $ret[$column] = $aircraft->{$column};
+            }
         }
 
-        // Modify special fields
-        $ret['subfleet'] = $aircraft->subfleet->type;
-
         return $ret;
     }
 }