diff --git a/app/Models/Airline.php b/app/Models/Airline.php
index 5282252..300fa86 100644
--- a/app/Models/Airline.php
+++ b/app/Models/Airline.php
@@ -15,12 +15,13 @@ use Illuminate\Database\Eloquent\Model;
  * 
  * @property int $id
  * @property string $name
- * @property string $country
+ * @property int $country_id
  * @property string $phone
  * @property int $status
  * @property Carbon $created_at
  * @property Carbon $updated_at
  * 
+ * @property Country $country
  * @property Collection|Flight[] $flights
  *
  * @package App\Models
@@ -31,16 +32,22 @@ class Airline extends Model
 	public static $snakeAttributes = false;
 
 	protected $casts = [
+		'country_id' => 'int',
 		'status' => 'int'
 	];
 
 	protected $fillable = [
 		'name',
-		'country',
+		'country_id',
 		'phone',
 		'status'
 	];
 
+	public function country()
+	{
+		return $this->belongsTo(Country::class);
+	}
+
 	public function flights()
 	{
 		return $this->hasMany(Flight::class);
diff --git a/app/Models/Airport.php b/app/Models/Airport.php
index 0ada8ec..0129a70 100644
--- a/app/Models/Airport.php
+++ b/app/Models/Airport.php
@@ -12,37 +12,47 @@ use Illuminate\Database\Eloquent\Model;
 
 /**
  * Class Airport
- * 
+ *
  * @property int $id
  * @property string $name
- * @property string $city
- * @property string $country
+ * @property int $city_id
  * @property int $status
  * @property Carbon $created_at
  * @property Carbon $updated_at
- * 
+ *
+ * @property City $city
  * @property Collection|Flight[] $flights
  *
  * @package App\Models
  */
 class Airport extends Model
 {
-	protected $table = 'airports';
-	public static $snakeAttributes = false;
+    protected $table = 'airports';
+    public static $snakeAttributes = false;
 
-	protected $casts = [
-		'status' => 'int'
-	];
+    protected $casts = [
+        'city_id' => 'int',
+        'status' => 'int'
+    ];
 
-	protected $fillable = [
-		'name',
-		'city',
-		'country',
-		'status'
-	];
+    protected $fillable = [
+        'name',
+        'city_id',
+        'status'
+    ];
 
-	public function flights()
-	{
-		return $this->hasMany(Flight::class, 'destination_airport_id');
-	}
+    public function city()
+    {
+        return $this->belongsTo(City::class);
+    }
+
+    public function originFlights()
+    {
+        return $this->hasMany(Flight::class, 'origin_airport_id');
+    }
+
+    public function destinationFlights()
+    {
+        return $this->hasMany(Flight::class, 'destination_airport_id');
+    }
 }
diff --git a/app/Models/City.php b/app/Models/City.php
index e5ddc35..c204b7c 100644
--- a/app/Models/City.php
+++ b/app/Models/City.php
@@ -25,6 +25,7 @@ use Illuminate\Database\Eloquent\SoftDeletes;
  * 
  * @property Country $country
  * @property Province $province
+ * @property Collection|Airport[] $airports
  * @property Collection|Tour[] $tours
  * @property Collection|User[] $users
  *
@@ -59,6 +60,11 @@ class City extends Model
 		return $this->belongsTo(Province::class);
 	}
 
+	public function airports()
+	{
+		return $this->hasMany(Airport::class);
+	}
+
 	public function tours()
 	{
 		return $this->hasMany(Tour::class, 'destination_city_id');
diff --git a/app/Models/Country.php b/app/Models/Country.php
index cdc2112..6e0db02 100644
--- a/app/Models/Country.php
+++ b/app/Models/Country.php
@@ -21,6 +21,7 @@ use Illuminate\Database\Eloquent\SoftDeletes;
  * @property Carbon $updated_at
  * @property string|null $deleted_at
  * 
+ * @property Collection|Airline[] $airlines
  * @property Collection|City[] $cities
  *
  * @package App\Models
@@ -40,6 +41,11 @@ class Country extends Model
 		'status'
 	];
 
+	public function airlines()
+	{
+		return $this->hasMany(Airline::class);
+	}
+
 	public function cities()
 	{
 		return $this->hasMany(City::class, 'county_id');
diff --git a/app/Models/File.php b/app/Models/File.php
index a73479a..5f051e0 100644
--- a/app/Models/File.php
+++ b/app/Models/File.php
@@ -22,6 +22,7 @@ use Illuminate\Database\Eloquent\Model;
  * @property Carbon $created_at
  * @property Carbon $updated_at
  * 
+ * @property Collection|Flight[] $flights
  * @property Collection|User[] $users
  *
  * @package App\Models
@@ -43,6 +44,11 @@ class File extends Model
 		'path'
 	];
 
+	public function flights()
+	{
+		return $this->hasMany(Flight::class);
+	}
+
 	public function users()
 	{
 		return $this->hasMany(User::class);