diff --git a/README.md b/README.md
index 5913ced..b50134a 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
 # Relations
 
+## Airport
+
+- HasMany Aircraft (2x, External DB)
diff --git a/models/Airport.php b/models/Airport.php
index 0dee282..72b9968 100644
--- a/models/Airport.php
+++ b/models/Airport.php
@@ -33,4 +33,9 @@ class Airport extends Model
     'latitude' => 'required',
     'longitude' => 'required',
   ];
+
+  public $hasMany = [
+    'based' => ['GermanAirlinesVa\Fleet\Models\Aircraft', 'key' => 'home_airport_id'],
+    'occupying' => ['GermanAirlinesVa\Fleet\Models\Aircraft', 'key' => 'airport_id'],
+  ];
 }