diff --git a/changelog.md b/changelog.md
index 4f334c32..92cdd620 100644
--- a/changelog.md
+++ b/changelog.md
@@ -19,6 +19,7 @@ Saves from 7.0.0 are compatible with 7.1.0
 * **[Mission Planning]** Per-flight TOT offsets can now be set in the flight details UI. This allows individual flights to be scheduled ahead of or behind the rest of the package.
 * **[New Game Wizard]** The air wing configuration dialog will check for and reject overfull airbases before continuing when the new squadron rules are used.
 * **[New Game Wizard]** Closing the air wing configuration dialog will now cancel and return to the new game wizard rather than reverting changes and continuing.
+* **[New Game Wizard]** A warning will be displayed next to the new squadron rules button if the campaign predates the new rules and will likely require user intervention before continuing.
 * **[UI]** Parking capacity of each squadron's base is now shown during air wing configuration to avoid overcrowding bases when beginning the game with full squadrons.
 
 ## Fixes
diff --git a/game/version.py b/game/version.py
index 9a30c660..48d8c66e 100644
--- a/game/version.py
+++ b/game/version.py
@@ -178,4 +178,8 @@ VERSION = _build_version_string()
 #:
 #: Version 10.8
 #: * Support for Normandy 2.
-CAMPAIGN_FORMAT_VERSION = (10, 8)
+#:
+#: Version 10.9
+#: * Campaign is compatible with new squadron rules. The default air wing configuration
+#:   has enough parking available at each base when squadrons begin at full strength.
+CAMPAIGN_FORMAT_VERSION = (10, 9)
diff --git a/qt_ui/windows/newgame/QNewGameWizard.py b/qt_ui/windows/newgame/QNewGameWizard.py
index e191890b..48965a11 100644
--- a/qt_ui/windows/newgame/QNewGameWizard.py
+++ b/qt_ui/windows/newgame/QNewGameWizard.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import logging
+import textwrap
 from datetime import datetime, timedelta
 from typing import List
 
@@ -40,7 +41,6 @@ jinja_env = Environment(
     lstrip_blocks=True,
 )
 
-
 """
 Possible time periods for new games
 
@@ -87,6 +87,10 @@ TIME_PERIODS = {
 }
 
 
+def wrap_label_text(text: str, width: int = 100) -> str:
+    return "<br />".join(textwrap.wrap(text, width=width))
+
+
 class NewGameWizard(QtWidgets.QWizard):
     def __init__(self, parent=None):
         super(NewGameWizard, self).__init__(parent)
@@ -115,7 +119,9 @@ class NewGameWizard(QtWidgets.QWizard):
         self.addPage(self.theater_page)
         self.addPage(self.faction_selection_page)
         self.addPage(GeneratorOptions(default_settings, mod_settings))
-        self.difficulty_page = DifficultyAndAutomationOptions(default_settings)
+        self.difficulty_page = DifficultyAndAutomationOptions(
+            default_settings, self.theater_page.campaignList.selected_campaign
+        )
         self.plugins_page = PluginsPage(self.lua_plugin_manager)
 
         # Update difficulty page on campaign select
@@ -573,8 +579,39 @@ class BudgetInputs(QtWidgets.QGridLayout):
         self.addWidget(self.starting_money, 1, 1)
 
 
+class NewSquadronRulesWarning(QLabel):
+    def __init__(
+        self, campaign: Campaign | None, parent: QWidget | None = None
+    ) -> None:
+        super().__init__(parent)
+        self.set_campaign(campaign)
+
+    def set_campaign(self, campaign: Campaign | None) -> None:
+        if campaign is None:
+            self.setText("No campaign selected")
+            return
+        if campaign.version >= (10, 9):
+            text = f"{campaign.name} is compatible with the new squadron rules."
+        elif campaign.version >= (10, 7):
+            text = (
+                f"{campaign.name} has been updated since the new squadron rules were "
+                "introduced, but support for those rules was still optional. You may "
+                "need to remove, resize, or relocate squadrons before beginning the "
+                "game."
+            )
+        else:
+            text = (
+                f"{campaign.name} has not been updated since the new squadron rules. "
+                "Were introduced. You may need to remove, resize, or relocate "
+                "squadrons before beginning the game."
+            )
+        self.setText(wrap_label_text(text))
+
+
 class DifficultyAndAutomationOptions(QtWidgets.QWizardPage):
-    def __init__(self, default_settings: Settings, parent=None) -> None:
+    def __init__(
+        self, default_settings: Settings, current_campaign: Campaign | None, parent=None
+    ) -> None:
         super().__init__(parent)
 
         self.setTitle("Difficulty and automation options")
@@ -615,10 +652,15 @@ class DifficultyAndAutomationOptions(QtWidgets.QWizardPage):
         new_squadron_rules.setChecked(default_settings.enable_squadron_aircraft_limits)
         self.registerField("use_new_squadron_rules", new_squadron_rules)
         economy_layout.addWidget(new_squadron_rules)
+        self.new_squadron_rules_warning = NewSquadronRulesWarning(current_campaign)
+        economy_layout.addWidget(self.new_squadron_rules_warning)
         economy_layout.addWidget(
             QLabel(
-                "With new squadron rules enabled, squadrons will not be able to exceed a maximum number of aircraft "
-                "(configurable), and the campaign will begin with all squadrons at full strength."
+                wrap_label_text(
+                    "With new squadron rules enabled, squadrons will not be able to "
+                    "exceed a maximum number of aircraft (configurable), and the "
+                    "campaign will begin with all squadrons at full strength."
+                )
             )
         )
 
@@ -656,6 +698,7 @@ class DifficultyAndAutomationOptions(QtWidgets.QWizardPage):
         self.enemy_income.spinner.setValue(
             int(campaign.recommended_enemy_income_multiplier * 10)
         )
+        self.new_squadron_rules_warning.set_campaign(campaign)
 
 
 class PluginOptionCheckbox(QCheckBox):