diff --git a/qt_ui/widgets/combos/QOriginAirfieldSelector.py b/qt_ui/widgets/combos/QOriginAirfieldSelector.py
index b0995a6b..904ec114 100644
--- a/qt_ui/widgets/combos/QOriginAirfieldSelector.py
+++ b/qt_ui/widgets/combos/QOriginAirfieldSelector.py
@@ -39,3 +39,9 @@ class QOriginAirfieldSelector(QComboBox):
                 self.addItem(f"{origin.name} ({available} available)", origin)
         self.model().sort(0)
         self.update()
+
+    @property
+    def available(self) -> int:
+        origin = self.currentData()
+        inventory = self.global_inventory.for_control_point(origin)
+        return inventory.available(self.aircraft)
diff --git a/qt_ui/windows/mission/flight/QFlightCreator.py b/qt_ui/windows/mission/flight/QFlightCreator.py
index 07082848..a2ca14ee 100644
--- a/qt_ui/windows/mission/flight/QFlightCreator.py
+++ b/qt_ui/windows/mission/flight/QFlightCreator.py
@@ -53,9 +53,11 @@ class QFlightCreator(QDialog):
             [cp for cp in game.theater.controlpoints if cp.captured],
             self.aircraft_selector.currentData()
         )
+        self.aircraft_selector.currentIndexChanged.connect(self.update_max_size)
         layout.addLayout(QLabeledWidget("Airfield:", self.airfield_selector))
 
         self.flight_size_spinner = QFlightSizeSpinner()
+        self.update_max_size()
         layout.addLayout(QLabeledWidget("Size:", self.flight_size_spinner))
 
         self.client_slots_spinner = QFlightSizeSpinner(
@@ -116,3 +118,8 @@ class QFlightCreator(QDialog):
     def on_aircraft_changed(self, index: int) -> None:
         new_aircraft = self.aircraft_selector.itemData(index)
         self.airfield_selector.change_aircraft(new_aircraft)
+
+    def update_max_size(self) -> None:
+        self.flight_size_spinner.setMaximum(
+            min(self.airfield_selector.available, 4)
+        )