Implemented Carrier Aerodrome AircraftBase Equipment

simulator/models/__init__.py

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+from .carrier import Carrier
+from .aircraft import Equipment, AircraftBase
+from .aerodrome import Aerodrome

simulator/models/aerodrome.py

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+from django.db import models
+
+
+class Aerodrome(models.Model):
+    icao = models.CharField(max_length=4, unique=True)
+    iata = models.CharField(max_length=3, unique=True, blank=True, null=True)
+    name = models.CharField(max_length=100)
+    city = models.CharField(max_length=100)
+    country = models.CharField(max_length=3)
+
+    def __str__(self):
+        return f"{self.icao} - {self.city}"

simulator/models/aircraft.py

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+from django.db import models
+
+
+class AircraftBase(models.Model):
+    name = models.CharField(max_length=20)
+    manufacturer = models.CharField(max_length=50)
+    range_nm = models.IntegerField()
+    capacity = models.IntegerField()
+    cruise_speed_kt = models.IntegerField()
+
+    def __str__(self):
+        return f"{self.manufacturer} {self.name}"
+
+
+class Equipment(models.Model):
+    registration = models.CharField(max_length=10, unique=True)
+    model = models.ForeignKey(
+        "AircraftBase", on_delete=models.CASCADE, related_name="aircraft"
+    )
+    owner = models.ForeignKey("Carrier", on_delete=models.CASCADE, related_name="fleet")
+
+    def __str__(self):
+        return f"{self.registration} ({self.model})"

simulator/models/carrier.py

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+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()