diff --git a/README.md b/README.md
index 5b6300c..adfcad8 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,3 @@
 ## AircraftTypes
 
 - Form Localization
-
-## Aircraft Type Groups
-
-- Form Localization
diff --git a/controllers/AircraftTypeGroups.php b/controllers/AircraftTypeGroup.php
similarity index 89%
rename from controllers/AircraftTypeGroups.php
rename to controllers/AircraftTypeGroup.php
index e8818f8..5e5e377 100644
--- a/controllers/AircraftTypeGroups.php
+++ b/controllers/AircraftTypeGroup.php
@@ -3,7 +3,7 @@
 use Backend\Classes\Controller;
 use BackendMenu;
 
-class AircraftTypeGroups extends Controller
+class AircraftTypeGroup extends Controller
 {
   public $implement = ['Backend\Behaviors\ListController', 'Backend\Behaviors\FormController'];
 
diff --git a/controllers/aircraft/config_list.yaml b/controllers/aircraft/config_list.yaml
index 73350a1..cf2ecaa 100644
--- a/controllers/aircraft/config_list.yaml
+++ b/controllers/aircraft/config_list.yaml
@@ -1,6 +1,6 @@
 list: $/germanairlinesva/fleet/models/aircraft/columns.yaml
 modelClass: GermanAirlinesVa\Fleet\Models\Aircraft
-title: Aircraft
+title: Aircrafts
 noRecordsMessage: 'backend::lang.list.no_records'
 showSetup: true
 showCheckboxes: true
diff --git a/controllers/aircrafttypegroups/_list_toolbar.htm b/controllers/aircrafttypegroup/_list_toolbar.htm
similarity index 93%
rename from controllers/aircrafttypegroups/_list_toolbar.htm
rename to controllers/aircrafttypegroup/_list_toolbar.htm
index 5fb5cc0..33f8678 100644
--- a/controllers/aircrafttypegroups/_list_toolbar.htm
+++ b/controllers/aircrafttypegroup/_list_toolbar.htm
@@ -1,5 +1,5 @@
 <div data-control="toolbar">
-  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups/create') ?>" class="btn btn-primary oc-icon-plus"
+  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup/create') ?>" class="btn btn-primary oc-icon-plus"
     ><?= e(trans('backend::lang.form.create')) ?></a
   >
   <button
diff --git a/controllers/aircrafttypegroup/config_form.yaml b/controllers/aircrafttypegroup/config_form.yaml
new file mode 100644
index 0000000..67db418
--- /dev/null
+++ b/controllers/aircrafttypegroup/config_form.yaml
@@ -0,0 +1,10 @@
+name: Aircraft Type Group
+form: $/germanairlinesva/fleet/models/aircrafttypegroup/fields.yaml
+modelClass: GermanAirlinesVa\Fleet\Models\AircraftTypeGroup
+defaultRedirect: germanairlinesva/fleet/aircrafttypegroup
+create:
+  redirect: 'germanairlinesva/fleet/aircrafttypegroup/update/:id'
+  redirectClose: germanairlinesva/fleet/aircrafttypegroup
+update:
+  redirect: germanairlinesva/fleet/aircrafttypegroup
+  redirectClose: germanairlinesva/fleet/aircrafttypegroup
diff --git a/controllers/aircrafttypegroups/config_list.yaml b/controllers/aircrafttypegroup/config_list.yaml
similarity index 77%
rename from controllers/aircrafttypegroups/config_list.yaml
rename to controllers/aircrafttypegroup/config_list.yaml
index 436c9dc..07dcac1 100644
--- a/controllers/aircrafttypegroups/config_list.yaml
+++ b/controllers/aircrafttypegroup/config_list.yaml
@@ -1,6 +1,6 @@
 list: $/germanairlinesva/fleet/models/aircrafttypegroup/columns.yaml
 modelClass: GermanAirlinesVa\Fleet\Models\AircraftTypeGroup
-title: AircraftTypeGroups
+title: Aircraft Type Groups
 noRecordsMessage: 'backend::lang.list.no_records'
 showSetup: true
 showCheckboxes: true
@@ -9,4 +9,4 @@ toolbar:
   buttons: list_toolbar
   search:
     prompt: 'backend::lang.list.search_prompt'
-recordUrl: 'germanairlinesva/fleet/aircrafttypegroups/update/:id'
+recordUrl: 'germanairlinesva/fleet/aircrafttypegroup/update/:id'
diff --git a/controllers/aircrafttypegroups/create.htm b/controllers/aircrafttypegroup/create.htm
similarity index 93%
rename from controllers/aircrafttypegroups/create.htm
rename to controllers/aircrafttypegroup/create.htm
index b4b029c..ea44cbc 100644
--- a/controllers/aircrafttypegroups/create.htm
+++ b/controllers/aircrafttypegroup/create.htm
@@ -1,6 +1,6 @@
 <?php Block::put('breadcrumb') ?>
 <ul>
-  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>">AircraftTypeGroups</a></li>
+  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>">Aircraft Type Groups</a></li>
   <li><?= e($this->pageTitle) ?></li>
 </ul>
 <?php Block::endPut() ?>
@@ -35,7 +35,7 @@
     </button>
     <span class="btn-text">
       <?= e(trans('backend::lang.form.or')) ?>
-      <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>"
+      <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>"
         ><?= e(trans('backend::lang.form.cancel')) ?></a
       >
     </span>
@@ -47,7 +47,7 @@
 <?php else: ?>
 <p class="flash-message static error"><?= e(trans($this->fatalError)) ?></p>
 <p>
-  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>" class="btn btn-default"
+  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>" class="btn btn-default"
     ><?= e(trans('backend::lang.form.return_to_list')) ?></a
   >
 </p>
diff --git a/controllers/aircrafttypegroups/index.htm b/controllers/aircrafttypegroup/index.htm
similarity index 100%
rename from controllers/aircrafttypegroups/index.htm
rename to controllers/aircrafttypegroup/index.htm
diff --git a/controllers/aircrafttypegroups/preview.htm b/controllers/aircrafttypegroup/preview.htm
similarity index 90%
rename from controllers/aircrafttypegroups/preview.htm
rename to controllers/aircrafttypegroup/preview.htm
index ded0d8f..d6a35b2 100644
--- a/controllers/aircrafttypegroups/preview.htm
+++ b/controllers/aircrafttypegroup/preview.htm
@@ -1,6 +1,6 @@
 <?php Block::put('breadcrumb') ?>
 <ul>
-  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>">AircraftTypeGroups</a></li>
+  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>">Aircraft Type Groups</a></li>
   <li><?= e($this->pageTitle) ?></li>
 </ul>
 <?php Block::endPut() ?>
@@ -15,7 +15,7 @@
 
 <p>
   <a
-    href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>"
+    href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>"
     class="btn btn-default oc-icon-chevron-left"
   >
     <?= e(trans('backend::lang.form.return_to_list')) ?>
diff --git a/controllers/aircrafttypegroups/update.htm b/controllers/aircrafttypegroup/update.htm
similarity index 94%
rename from controllers/aircrafttypegroups/update.htm
rename to controllers/aircrafttypegroup/update.htm
index 2c7eb86..8909a31 100644
--- a/controllers/aircrafttypegroups/update.htm
+++ b/controllers/aircrafttypegroup/update.htm
@@ -1,6 +1,6 @@
 <?php Block::put('breadcrumb') ?>
 <ul>
-  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>">AircraftTypeGroups</a></li>
+  <li><a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>">Aircraft Type Groups</a></li>
   <li><?= e($this->pageTitle) ?></li>
 </ul>
 <?php Block::endPut() ?>
@@ -44,7 +44,7 @@
 
     <span class="btn-text">
       <?= e(trans('backend::lang.form.or')) ?>
-      <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>"
+      <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>"
         ><?= e(trans('backend::lang.form.cancel')) ?></a
       >
     </span>
@@ -55,7 +55,7 @@
 <?php else: ?>
 <p class="flash-message static error"><?= e(trans($this->fatalError)) ?></p>
 <p>
-  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroups') ?>" class="btn btn-default"
+  <a href="<?= Backend::url('germanairlinesva/fleet/aircrafttypegroup') ?>" class="btn btn-default"
     ><?= e(trans('backend::lang.form.return_to_list')) ?></a
   >
 </p>
diff --git a/controllers/aircrafttypegroups/config_form.yaml b/controllers/aircrafttypegroups/config_form.yaml
deleted file mode 100644
index 4eaca4c..0000000
--- a/controllers/aircrafttypegroups/config_form.yaml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: AircraftTypeGroups
-form: $/germanairlinesva/fleet/models/aircrafttypegroup/fields.yaml
-modelClass: GermanAirlinesVa\Fleet\Models\AircraftTypeGroup
-defaultRedirect: germanairlinesva/fleet/aircrafttypegroups
-create:
-  redirect: 'germanairlinesva/fleet/aircrafttypegroups/update/:id'
-  redirectClose: germanairlinesva/fleet/aircrafttypegroups
-update:
-  redirect: germanairlinesva/fleet/aircrafttypegroups
-  redirectClose: germanairlinesva/fleet/aircrafttypegroups
diff --git a/lang/en/lang.php b/lang/en/lang.php
index 48dc683..afcf1b8 100644
--- a/lang/en/lang.php
+++ b/lang/en/lang.php
@@ -14,6 +14,9 @@
     'name' => 'Aircraft Name',
     'home_base' => 'Aircraft Home Base',
   ],
+  'aircraft_type_groups' => [
+    'comment' => 'Comment Identifying Aircraft Type Group',
+  ],
   'menu' => [
     'main' => 'GA Fleet',
     'manufacturers' => 'Aircraft Manufacturers',
diff --git a/models/AircraftTypeGroup.php b/models/AircraftTypeGroup.php
index 6ab4f57..a7c968a 100644
--- a/models/AircraftTypeGroup.php
+++ b/models/AircraftTypeGroup.php
@@ -24,7 +24,9 @@ class AircraftTypeGroup extends Model
   /**
    * @var array Validation rules
    */
-  public $rules = [];
+  public $rules = [
+    'comment' => 'required',
+  ];
 
   public $belongsToMany = [
     'aircraft_types' => 'GermanAirlinesVa\Fleet\Models\AircraftType',
diff --git a/models/aircrafttypegroup/fields.yaml b/models/aircrafttypegroup/fields.yaml
index abb53a9..bee7fe8 100644
--- a/models/aircrafttypegroup/fields.yaml
+++ b/models/aircrafttypegroup/fields.yaml
@@ -1,5 +1,5 @@
 fields:
   comment:
-    label: Comment
+    label: 'germanairlinesva.fleet::lang.aircraft_type_groups.comment'
     span: auto
     type: text