'required', 'icao' => 'required', 'name' => 'required', 'country' => 'required', 'elevation' => 'required', 'latitude' => 'required', 'longitude' => 'required', ]; public $hasMany = [ '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', ], ]; }