Implemented Carrier Aerodrome AircraftBase Equipment

simulator/models/carrier.py

@@ -0,0 +1,15 @@
+from django.db import models
+from .aircraft import Equipment
+
+
+class Carrier(models.Model):
+    icao = models.CharField(max_length=3, unique=True)
+    iata = models.CharField(max_length=2, unique=True)
+    name = models.CharField(max_length=100, unique=True)
+    country = models.CharField(max_length=3)
+
+    def __str__(self) -> str:
+        return f"{self.name} ({self.icao}/{self.iata})"
+
+    def fleet_size(self) -> int:
+        return Equipment.objects.filter(owner=self).count()