Airports Model/Controller

updates/builder_table_create_airports.php

@@ -11,7 +11,7 @@ class BuilderTableCreateAirports extends Migration
       $table->engine = 'InnoDB';
       $table->bigIncrements('id')->unsigned();
       $table->string('iata', 3);
-      $table->string('icao', 3);
+      $table->string('icao', 4);
       $table->string('name');
       $table->string('country');
       $table->string('elevation');