some refactoring for tests and adding some tables

app/Models/AircraftClass.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Models;
+
+use Eloquent as Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * Class AircraftClass
+ * @package App\Models
+ * @version June 9, 2017, 8:10 pm UTC
+ */
+class AircraftClass extends Model
+{
+    //use SoftDeletes;
+
+    public $table = 'aircraft_classes';
+
+    protected $dates = ['deleted_at'];
+
+    public $fillable = [
+        'code',
+        'name',
+        'notes'
+    ];
+
+    /**
+     * The attributes that should be casted to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'code' => 'string',
+        'name' => 'string',
+        'notes' => 'string'
+    ];
+
+    /**
+     * Validation rules
+     *
+     * @var array
+     */
+    public static $rules = [
+        'code' => 'required',
+        'name' => 'required'
+    ];
+}