diff --git a/README.md b/README.md
index b50134a..7dae7d4 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,9 @@
 ## Airport
 
 - HasMany Aircraft (2x, External DB)
+- BelongsToMany Airport (Defined via Alternate)
+
+
+## Alternate
+
+- BelongsTo Airport (2x)
diff --git a/controllers/Alternate.php b/controllers/Alternate.php
new file mode 100644
index 0000000..b0f91fc
--- /dev/null
+++ b/controllers/Alternate.php
@@ -0,0 +1,17 @@
+<?php namespace GermanAirlinesVa\Routes\Controllers;
+
+use Backend\Classes\Controller;
+use BackendMenu;
+
+class Alternate extends Controller
+{
+  public $implement = ['Backend\Behaviors\ListController', 'Backend\Behaviors\FormController'];
+
+  public $listConfig = 'config_list.yaml';
+  public $formConfig = 'config_form.yaml';
+
+  public function __construct()
+  {
+    parent::__construct();
+  }
+}
diff --git a/controllers/alternate/_list_toolbar.htm b/controllers/alternate/_list_toolbar.htm
new file mode 100644
index 0000000..1ada626
--- /dev/null
+++ b/controllers/alternate/_list_toolbar.htm
@@ -0,0 +1,18 @@
+<div data-control="toolbar">
+        <a href="<?= Backend::url('germanairlinesva/routes/alternate/create') ?>" class="btn btn-primary oc-icon-plus"><?= e(trans('backend::lang.form.create')) ?></a>
+            <button
+        class="btn btn-default oc-icon-trash-o"
+        disabled="disabled"
+        onclick="$(this).data('request-data', {
+            checked: $('.control-list').listWidget('getChecked')
+        })"
+        data-request="onDelete"
+        data-request-confirm="<?= e(trans('backend::lang.list.delete_selected_confirm')) ?>"
+        data-trigger-action="enable"
+        data-trigger=".control-list input[type=checkbox]"
+        data-trigger-condition="checked"
+        data-request-success="$(this).prop('disabled', true)"
+        data-stripe-load-indicator>
+        <?= e(trans('backend::lang.list.delete_selected')) ?>
+    </button>
+</div>
diff --git a/controllers/alternate/config_form.yaml b/controllers/alternate/config_form.yaml
new file mode 100644
index 0000000..ce7c631
--- /dev/null
+++ b/controllers/alternate/config_form.yaml
@@ -0,0 +1,10 @@
+name: Alternate
+form: $/germanairlinesva/routes/models/alternate/fields.yaml
+modelClass: GermanAirlinesVa\Routes\Models\Alternate
+defaultRedirect: germanairlinesva/routes/alternate
+create:
+  redirect: 'germanairlinesva/routes/alternate/update/:id'
+  redirectClose: germanairlinesva/routes/alternate
+update:
+  redirect: germanairlinesva/routes/alternate
+  redirectClose: germanairlinesva/routes/alternate
diff --git a/controllers/alternate/config_list.yaml b/controllers/alternate/config_list.yaml
new file mode 100644
index 0000000..431dc67
--- /dev/null
+++ b/controllers/alternate/config_list.yaml
@@ -0,0 +1,12 @@
+list: $/germanairlinesva/routes/models/alternate/columns.yaml
+modelClass: GermanAirlinesVa\Routes\Models\Alternate
+title: Alternates
+noRecordsMessage: 'backend::lang.list.no_records'
+showSetup: true
+showCheckboxes: true
+recordsPerPage: 20
+toolbar:
+  buttons: list_toolbar
+  search:
+    prompt: 'backend::lang.list.search_prompt'
+recordUrl: 'germanairlinesva/routes/alternate/update/:id'
diff --git a/controllers/alternate/create.htm b/controllers/alternate/create.htm
new file mode 100644
index 0000000..47abfb4
--- /dev/null
+++ b/controllers/alternate/create.htm
@@ -0,0 +1,46 @@
+<?php Block::put('breadcrumb') ?>
+    <ul>
+        <li><a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>">Alternates</a></li>
+        <li><?= e($this->pageTitle) ?></li>
+    </ul>
+<?php Block::endPut() ?>
+
+<?php if (!$this->fatalError): ?>
+
+    <?= Form::open(['class' => 'layout']) ?>
+
+        <div class="layout-row">
+            <?= $this->formRender() ?>
+        </div>
+
+        <div class="form-buttons">
+            <div class="loading-indicator-container">
+                <button
+                    type="submit"
+                    data-request="onSave"
+                    data-hotkey="ctrl+s, cmd+s"
+                    data-load-indicator="<?= e(trans('backend::lang.form.saving')) ?>"
+                    class="btn btn-primary">
+                    <?= e(trans('backend::lang.form.create')) ?>
+                </button>
+                <button 
+                    type="button"
+                    data-request="onSave"
+                    data-request-data="close:1"
+                    data-hotkey="ctrl+enter, cmd+enter"
+                    data-load-indicator="<?= e(trans('backend::lang.form.saving')) ?>"
+                    class="btn btn-default">
+                    <?= e(trans('backend::lang.form.create_and_close')) ?>
+                </button>
+                <span class="btn-text">
+                    <?= e(trans('backend::lang.form.or')) ?> <a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>"><?= e(trans('backend::lang.form.cancel')) ?></a>
+                </span>
+            </div>
+        </div>
+
+    <?= Form::close() ?>
+
+<?php else: ?>
+    <p class="flash-message static error"><?= e(trans($this->fatalError)) ?></p>
+    <p><a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>" class="btn btn-default"><?= e(trans('backend::lang.form.return_to_list')) ?></a></p>
+<?php endif ?>
diff --git a/controllers/alternate/index.htm b/controllers/alternate/index.htm
new file mode 100644
index 0000000..ea43a36
--- /dev/null
+++ b/controllers/alternate/index.htm
@@ -0,0 +1 @@
+<?= $this->listRender() ?>
diff --git a/controllers/alternate/preview.htm b/controllers/alternate/preview.htm
new file mode 100644
index 0000000..1e7ddf1
--- /dev/null
+++ b/controllers/alternate/preview.htm
@@ -0,0 +1,22 @@
+<?php Block::put('breadcrumb') ?>
+    <ul>
+        <li><a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>">Alternates</a></li>
+        <li><?= e($this->pageTitle) ?></li>
+    </ul>
+<?php Block::endPut() ?>
+
+<?php if (!$this->fatalError): ?>
+
+    <div class="form-preview">
+        <?= $this->formRenderPreview() ?>
+    </div>
+
+<?php else: ?>
+    <p class="flash-message static error"><?= e($this->fatalError) ?></p>
+<?php endif ?>
+
+<p>
+    <a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>" class="btn btn-default oc-icon-chevron-left">
+        <?= e(trans('backend::lang.form.return_to_list')) ?>
+    </a>
+</p>
diff --git a/controllers/alternate/update.htm b/controllers/alternate/update.htm
new file mode 100644
index 0000000..6cad925
--- /dev/null
+++ b/controllers/alternate/update.htm
@@ -0,0 +1,54 @@
+<?php Block::put('breadcrumb') ?>
+    <ul>
+        <li><a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>">Alternates</a></li>
+        <li><?= e($this->pageTitle) ?></li>
+    </ul>
+<?php Block::endPut() ?>
+
+<?php if (!$this->fatalError): ?>
+
+    <?= Form::open(['class' => 'layout']) ?>
+
+        <div class="layout-row">
+            <?= $this->formRender() ?>
+        </div>
+
+        <div class="form-buttons">
+            <div class="loading-indicator-container">
+                <button
+                    type="submit"
+                    data-request="onSave"
+                    data-request-data="redirect:0"
+                    data-hotkey="ctrl+s, cmd+s"
+                    data-load-indicator="<?= e(trans('backend::lang.form.saving')) ?>"
+                    class="btn btn-primary">
+                    <?= e(trans('backend::lang.form.save')) ?>
+                </button>
+                <button
+                    type="button"
+                    data-request="onSave"
+                    data-request-data="close:1"
+                    data-hotkey="ctrl+enter, cmd+enter"
+                    data-load-indicator="<?= e(trans('backend::lang.form.saving')) ?>"
+                    class="btn btn-default">
+                    <?= e(trans('backend::lang.form.save_and_close')) ?>
+                </button>
+                <button
+                    type="button"
+                    class="oc-icon-trash-o btn-icon danger pull-right"
+                    data-request="onDelete"
+                    data-load-indicator="<?= e(trans('backend::lang.form.deleting')) ?>"
+                    data-request-confirm="<?= e(trans('backend::lang.form.confirm_delete')) ?>">
+                </button>
+
+                <span class="btn-text">
+                    <?= e(trans('backend::lang.form.or')) ?> <a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>"><?= e(trans('backend::lang.form.cancel')) ?></a>
+                </span>
+            </div>
+        </div>
+    <?= Form::close() ?>
+
+<?php else: ?>
+    <p class="flash-message static error"><?= e(trans($this->fatalError)) ?></p>
+    <p><a href="<?= Backend::url('germanairlinesva/routes/alternate') ?>" class="btn btn-default"><?= e(trans('backend::lang.form.return_to_list')) ?></a></p>
+<?php endif ?>
diff --git a/lang/en/lang.php b/lang/en/lang.php
index c14d4ee..aac03be 100644
--- a/lang/en/lang.php
+++ b/lang/en/lang.php
@@ -24,4 +24,9 @@
       'routes' => 'Manage Routes',
     ],
   ],
+  'alternates' => [
+    'airport' => 'Airport',
+    'alternate' => 'Alternate',
+    'index' => 'Index',
+  ],
 ];
diff --git a/models/Airport.php b/models/Airport.php
index 72b9968..e4b7729 100644
--- a/models/Airport.php
+++ b/models/Airport.php
@@ -38,4 +38,13 @@ class Airport extends Model
     'based' => ['GermanAirlinesVa\Fleet\Models\Aircraft', 'key' => 'home_airport_id'],
     'occupying' => ['GermanAirlinesVa\Fleet\Models\Aircraft', 'key' => 'airport_id'],
   ];
+
+  public $belongsToMany = [
+    'alternates' => [
+      'GermanAirlinesVa\Routes\Models\Airport',
+      'table' => 'alternates',
+      'key' => 'airport_id',
+      'otherKey' => 'alternate_id',
+    ],
+  ];
 }
diff --git a/models/Alternate.php b/models/Alternate.php
new file mode 100644
index 0000000..17ff06c
--- /dev/null
+++ b/models/Alternate.php
@@ -0,0 +1,36 @@
+<?php namespace GermanAirlinesVa\Routes\Models;
+
+use Model;
+
+/**
+ * Model
+ */
+class Alternate extends Model
+{
+  use \October\Rain\Database\Traits\Validation;
+
+  /*
+   * Disable timestamps by default.
+   * Remove this line if timestamps are defined in the database table.
+   */
+  public $timestamps = false;
+
+  /**
+   * @var string The database table used by the model.
+   */
+  public $table = 'alternates';
+  protected $connection = 'germanairlinesva_routes';
+
+  /**
+   * @var array Validation rules
+   */
+  public $rules = [
+    'airport_id' => 'required',
+    'alternate_id' => 'required',
+  ];
+
+  public $belongsTo = [
+    'airport' => ['GermanAirlinesVa\Routes\Models\Airport', 'key' => 'airport_id'],
+    'alternate' => ['GermanAirlinesVa\Routes\Models\Airport', 'key' => 'alternate_id'],
+  ];
+}
diff --git a/models/alternate/columns.yaml b/models/alternate/columns.yaml
new file mode 100644
index 0000000..fedc7ba
--- /dev/null
+++ b/models/alternate/columns.yaml
@@ -0,0 +1,17 @@
+columns:
+  id:
+    label: id
+    type: number
+  airport:
+    label: airport
+    type: text
+    relation: airport
+    valueFrom: icao
+  alternate:
+    label: alternate
+    type: text
+    relation: alternate
+    valueFrom: icao
+  index:
+    label: index
+    type: number
diff --git a/models/alternate/fields.yaml b/models/alternate/fields.yaml
new file mode 100644
index 0000000..8432a61
--- /dev/null
+++ b/models/alternate/fields.yaml
@@ -0,0 +1,21 @@
+fields:
+  airport:
+    label: 'germanairlinesva.routes::lang.alternates.airport'
+    nameFrom: icao
+    descriptionFrom: description
+    span: auto
+    required: 1
+    type: relation
+  alternate:
+    label: 'germanairlinesva.routes::lang.alternates.alternate'
+    nameFrom: icao
+    descriptionFrom: description
+    span: auto
+    required: 1
+    type: relation
+  index:
+    label: 'germanairlinesva.routes::lang.alternates.index'
+    span: auto
+    default: '0'
+    required: 1
+    type: number
diff --git a/updates/builder_table_create_airports.php b/updates/builder_table_create_airports.php
index 43a76fc..3ca566b 100644
--- a/updates/builder_table_create_airports.php
+++ b/updates/builder_table_create_airports.php
@@ -33,6 +33,8 @@ class BuilderTableCreateAirports extends Migration
 
   public function down()
   {
+    Schema::connection('germanairlinesva_routes')->disableForeignKeyConstraints();
     Schema::connection('germanairlinesva_routes')->dropIfExists('airports');
+    Schema::connection('germanairlinesva_routes')->enableForeignKeyConstraints();
   }
 }
diff --git a/updates/builder_table_create_alternates.php b/updates/builder_table_create_alternates.php
new file mode 100644
index 0000000..34c947e
--- /dev/null
+++ b/updates/builder_table_create_alternates.php
@@ -0,0 +1,36 @@
+<?php namespace GermanAirlinesVa\Routes\Updates;
+
+use Schema;
+use October\Rain\Database\Updates\Migration;
+
+class BuilderTableCreateAlternates extends Migration
+{
+  public function up()
+  {
+    Schema::connection('germanairlinesva_routes')->create('alternates', function ($table) {
+      $table->engine = 'InnoDB';
+      $table->bigIncrements('id')->unsigned();
+      $table->bigInteger('airport_id')->unsigned();
+      $table
+        ->foreign('airport_id')
+        ->references('id')
+        ->on('airports');
+      $table->bigInteger('alternate_id')->unsigned();
+      $table
+        ->foreign('alternate_id')
+        ->references('id')
+        ->on('airports');
+      $table
+        ->integer('index')
+        ->unsigned()
+        ->default(0);
+    });
+  }
+
+  public function down()
+  {
+    Schema::connection('germanairlinesva_routes')->enableForeignKeyConstraints();
+    Schema::connection('germanairlinesva_routes')->dropIfExists('alternates');
+    Schema::connection('germanairlinesva_routes')->enableForeignKeyConstraints();
+  }
+}
diff --git a/updates/version.yaml b/updates/version.yaml
index f0b4938..d0a175f 100644
--- a/updates/version.yaml
+++ b/updates/version.yaml
@@ -5,3 +5,5 @@
 1.0.2:
   - 'Create table airports'
   - builder_table_create_airports.php
+  - 'Create table alternates'
+  - builder_table_create_alternates.php
diff --git a/yarn.lock b/yarn.lock
index afc768a..df5d0a6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -41,9 +41,9 @@ p-defer@^1.0.0:
   resolved "https://registry.yarnpkg.com/p-defer/-/p-defer-1.0.0.tgz#9f6eb182f6c9aa8cd743004a7d4f96b196b0fb0c"
   integrity sha1-n26xgvbJqozXQwBKfU+WsZaw+ww=
 
-"php-parser@git+https://github.com/glayzzle/php-parser.git#e61e26102144f267ecf5e09020865a9baa6ca2f1":
+"php-parser@https://github.com/glayzzle/php-parser#e61e26102144f267ecf5e09020865a9baa6ca2f1":
   version "3.0.2"
-  resolved "git+https://github.com/glayzzle/php-parser.git#e61e26102144f267ecf5e09020865a9baa6ca2f1"
+  resolved "https://github.com/glayzzle/php-parser#e61e26102144f267ecf5e09020865a9baa6ca2f1"
 
 prettier@^2.3.0:
   version "2.3.2"