some refactoring for tests and adding some tables

database/factories/AircraftClassFactory.php

@@ -0,0 +1,10 @@
+<?php
+
+$factory->define(App\Models\AircraftClass::class, function (Faker\Generator $faker) {
+    return [
+        'id' => 1,
+        'code' => 'H',
+        'name' => 'Heavy',
+        'notes' => 'Heavy aircraft',
+    ];
+});

database/factories/ModelFactory.php

@@ -1,16 +1,5 @@
 <?php
 
-/*
-|--------------------------------------------------------------------------
-| Model Factories
-|--------------------------------------------------------------------------
-|
-| Here you may define all of your model factories. Model factories give
-| you a convenient way to create models for testing and seeding your
-| database. Just tell the factory how a default model should look.
-|
-*/
-
 $factory->define(App\User::class, function (Faker\Generator $faker) {
     static $password;