Airline > Subfleet Relationship (#970)

app/Models/Airline.php

@@ -97,6 +97,11 @@ class Airline extends Model
         $this->attributes['icao'] = strtoupper($icao);
     }
 
+    public function subfleets()
+    {
+        return $this->hasMany(Subfleet::class, 'airline_id');
+    }
+
     public function flights()
     {
         return $this->belongsTo(Flight::class, 'airline_id');