diff --git a/changelog.md b/changelog.md
index 84f61b7b..859cf0ce 100644
--- a/changelog.md
+++ b/changelog.md
@@ -6,6 +6,7 @@ Saves from 6.x are not compatible with 7.0.
 
 * **[Engine]** Support for DCS 2.8.2.35632.
 * **[Engine]** Saved games are now a zip file of save assets for easier bug reporting. The new extension is .liberation.zip. Drag and drop that file into bug reports.
+* **[Flight Planning]** Package TOT and composition can be modified after advancing time in Liberation.
 * **[Mission Generation]** Units on the front line are now hidden on MFDs.
 * **[Modding]** Updated Community A-4E-C mod version support to 2.1.0 release.
 * **[Modding]** Add support for VSN F-4B and F-4C mod.
diff --git a/qt_ui/windows/mission/QPackageDialog.py b/qt_ui/windows/mission/QPackageDialog.py
index dfe834e2..1feb64ff 100644
--- a/qt_ui/windows/mission/QPackageDialog.py
+++ b/qt_ui/windows/mission/QPackageDialog.py
@@ -115,6 +115,9 @@ class QPackageDialog(QDialog):
 
         self.add_flight_button = QPushButton("Add Flight")
         self.add_flight_button.clicked.connect(self.on_add_flight)
+        self.add_flight_button.setEnabled(
+            self.package_model.package.all_flights_waiting_for_start()
+        )
         self.button_layout.addWidget(self.add_flight_button)
 
         self.delete_flight_button = QPushButton("Delete Selected")