diff --git a/src/blackcore/progress.h b/src/blackcore/progress.h
index e0883c831..aa952d9f9 100644
--- a/src/blackcore/progress.h
+++ b/src/blackcore/progress.h
@@ -24,6 +24,9 @@ namespace BlackCore
         //! Update the progress indicator 0..100
         virtual void updateProgressIndicator(int percentage) = 0;
 
+        //! Dtor
+        virtual ~IProgressIndicator() {}
+
         //! Same as updateProgressIndicator but processing events
         void updateProgressIndicatorAndProcessEvents(int percentage)
         {
diff --git a/src/blackgui/components/dbownmodelsetcomponent.cpp b/src/blackgui/components/dbownmodelsetcomponent.cpp
index 7a6c213af..83e6bd41e 100644
--- a/src/blackgui/components/dbownmodelsetcomponent.cpp
+++ b/src/blackgui/components/dbownmodelsetcomponent.cpp
@@ -306,13 +306,15 @@ namespace BlackGui
             CAircraftModelList models = ui->tvp_OwnModelSet->containerOrFilteredContainer();
             const CSimulatorInfo simulator = this->getModelSetSimulator();
             m_reduceModelsDialog->setModels(models, simulator);
-            QDialog::DialogCode ret = static_cast<QDialog::DialogCode>(m_reduceModelsDialog->exec());
+            const QDialog::DialogCode ret = static_cast<QDialog::DialogCode>(m_reduceModelsDialog->exec());
             if (ret != QDialog::Accepted) { return; }
             const CAircraftModelList removeModels = m_reduceModelsDialog->getRemoveCandidates();
             const CSimulatorInfo removeSimulator  = m_reduceModelsDialog->getSimulator();
             if (removeModels.isEmpty()) { return; }
-            const QSet<int> keys = removeModels.toDbKeySet();
-            models.removeObjectsWithKeys(keys);
+            // const QSet<int> keys = removeModels.toDbKeySet();
+            // models.removeObjectsWithKeys(keys);
+            const QStringList modelStrings = removeModels.getModelStringList(false);
+            models.removeModelsWithString(modelStrings, Qt::CaseInsensitive); // by strings also removes if id is missing
             this->setModelSet(models, removeSimulator);
         }
 
diff --git a/src/blackgui/components/dbreducemodelduplicates.cpp b/src/blackgui/components/dbreducemodelduplicates.cpp
index 84817aa94..ea644d3ea 100644
--- a/src/blackgui/components/dbreducemodelduplicates.cpp
+++ b/src/blackgui/components/dbreducemodelduplicates.cpp
@@ -32,12 +32,15 @@ namespace BlackGui
             ui(new Ui::CDbReduceModelDuplicates)
         {
             ui->setupUi(this);
+            this->clearProgressBar();
+
             this->setWindowFlags(this->windowFlags() & ~Qt::WindowContextHelpButtonHint);
             ui->tvp_RemoveModels->menuAddItems(CAircraftModelView::MenuRemoveSelectedRows);
             ui->tvp_RemoveModels->setAircraftModelMode(CAircraftModelListModel::OwnModelSet);
             ui->le_Distributor->setValidator(new CUpperCaseValidator(ui->le_Distributor));
 
             connect(ui->pb_Run, &QPushButton::clicked, this, &CDbReduceModelDuplicates::process);
+            connect(ui->pb_Stop, &QPushButton::clicked, this, &CDbReduceModelDuplicates::stop);
         }
 
         CDbReduceModelDuplicates::~CDbReduceModelDuplicates()
@@ -45,6 +48,8 @@ namespace BlackGui
 
         void CDbReduceModelDuplicates::setModels(const CAircraftModelList &models, const CSimulatorInfo &simulator)
         {
+            this->clearProgressBar();
+
             const bool changedSim = (m_simulator != simulator);
             if (changedSim)
             {
@@ -71,6 +76,10 @@ namespace BlackGui
         void CDbReduceModelDuplicates::process()
         {
             if (!sGui || sGui->isShuttingDown()) { return; }
+
+            this->clearProgressBar();
+            m_stop = false;
+
             if (m_models.isEmpty())
             {
                 const CStatusMessage m = CStatusMessage(this).validationError("No models");
@@ -103,32 +112,60 @@ namespace BlackGui
             }
 
             const CAircraftModelList distributorModels = m_models.findByDistributor(distributor);
-            CAircraftModelList nonDistributorModels = m_models;
-            nonDistributorModels.removeByDistributor(distributor); // all models of other distrbutors
+            CAircraftModelList otherDistributorsModels = m_models;
+            otherDistributorsModels.removeByDistributor(distributor); // all models of other distrbutors
             CAircraftModelList removeModels;
 
+            ui->pb_Progress->setMaximum(distributorModels.sizeInt());
+            ui->pb_Progress->setValue(0);
+
+            int mc = 0;
             for (const CAircraftModel &distributorModel : distributorModels)
             {
+                if (m_stop) { break; }
                 if (!distributorModel.getLivery().isAirlineLivery()) { continue; }
                 if (!distributorModel.getAircraftIcaoCode().hasValidDbKey()) { continue; }
                 if (ui->rb_SameLiveryAndAircraft->isChecked())
                 {
-                    removeModels.replaceOrAddModelsWithString(nonDistributorModels.findByAircraftAndLivery(distributorModel.getAircraftIcaoCode(), distributorModel.getLivery()), Qt::CaseInsensitive);
+                    removeModels.replaceOrAddModelsWithString(otherDistributorsModels.findByAircraftAndLivery(distributorModel.getAircraftIcaoCode(), distributorModel.getLivery()), Qt::CaseInsensitive);
                 }
                 else if (ui->rb_SameAirlineAndAircraft->isChecked())
                 {
-                    removeModels.replaceOrAddModelsWithString(nonDistributorModels.findByAircraftAndAirline(distributorModel.getAircraftIcaoCode(), distributorModel.getAirlineIcaoCode()), Qt::CaseInsensitive);
+                    removeModels.replaceOrAddModelsWithString(otherDistributorsModels.findByAircraftAndAirline(distributorModel.getAircraftIcaoCode(), distributorModel.getAirlineIcaoCode()), Qt::CaseInsensitive);
                 }
+
+                if (mc % 50 == 0) { ui->pb_Progress->setValue(mc); }
+                if (mc % 100 == 0) { CGuiApplication::processEventsFor(10); }
+                mc++;
             }
 
+            if (!m_stop) { ui->pb_Progress->setValue(distributorModels.sizeInt()); }
             ui->tvp_RemoveModels->updateContainerMaybeAsync(removeModels);
             m_removeCandidates = removeModels;
+            m_stop = false;
 
             const QString distKeys = removeModels.getDistributors().dbKeysAsString(", ");
-            const CStatusMessage m = removeModels.isEmpty() ?
-                                     CStatusMessage(this).info("No duplicates to be removed!")  :
-                                     CStatusMessage(this).info("You can remove %1 models of the following distributors: '%2'.") << removeModels.size() << distKeys;
-            ui->fr_Overlay->showOverlayHTMLMessage(m, 5000);
+            const CStatusMessage msg = removeModels.isEmpty() ?
+                                       CStatusMessage(this).info("No duplicates to be removed!")  :
+                                       CStatusMessage(this).info("You can remove %1 models of the following distributors: '%2'.") << removeModels.size() << distKeys;
+            ui->fr_Overlay->showOverlayHTMLMessage(msg, 5000);
         }
+
+        void CDbReduceModelDuplicates::updateProgressIndicator(int percentage)
+        {
+            const int delta = ui->pb_Progress->maximum() - ui->pb_Progress->minimum();
+            const double p = percentage;
+            const int value = qRound(delta * 100.0 / p);
+            ui->pb_Progress->setValue(value);
+        }
+
+        void CDbReduceModelDuplicates::clearProgressBar()
+        {
+            ui->pb_Progress->setMaximum(100); // otherwise undetermined
+            ui->pb_Progress->setMinimum(0);
+            ui->pb_Progress->setValue(0);
+            ui->pb_Progress->setFormat("%v/%m");
+        }
+
     } // ns
 } // ns
diff --git a/src/blackgui/components/dbreducemodelduplicates.h b/src/blackgui/components/dbreducemodelduplicates.h
index 43fabdb76..705aae646 100644
--- a/src/blackgui/components/dbreducemodelduplicates.h
+++ b/src/blackgui/components/dbreducemodelduplicates.h
@@ -12,6 +12,7 @@
 #ifndef BLACKGUI_COMPONENTS_DBREDUCEMODELDUPLICATES_H
 #define BLACKGUI_COMPONENTS_DBREDUCEMODELDUPLICATES_H
 
+#include "blackcore/progress.h"
 #include "blackmisc/simulation/aircraftmodellist.h"
 #include "blackmisc/simulation/settings/modelsettings.h"
 #include "blackmisc/settingscache.h"
@@ -25,7 +26,9 @@ namespace BlackGui
     namespace Components
     {
         //! Reduce modelss
-        class CDbReduceModelDuplicates : public QDialog
+        class CDbReduceModelDuplicates :
+            public QDialog,
+            public BlackCore::IProgressIndicator
         {
             Q_OBJECT
 
@@ -34,7 +37,7 @@ namespace BlackGui
             explicit CDbReduceModelDuplicates(QWidget *parent = nullptr);
 
             //! Destructor
-            virtual ~CDbReduceModelDuplicates();
+            virtual ~CDbReduceModelDuplicates() override;
 
             //! Set the models
             void setModels(const BlackMisc::Simulation::CAircraftModelList &models, const BlackMisc::Simulation::CSimulatorInfo &simulator);
@@ -42,6 +45,9 @@ namespace BlackGui
             //! Process models
             void process();
 
+            //! \copydoc BlackCore::IProgressIndicator::updateProgressIndicator
+            virtual void updateProgressIndicator(int percentage) override;
+
             //! The models to be removed
             const BlackMisc::Simulation::CAircraftModelList &getRemoveCandidates() const { return m_removeCandidates; }
 
@@ -49,7 +55,14 @@ namespace BlackGui
             const BlackMisc::Simulation::CSimulatorInfo &getSimulator() const { return m_simulator; }
 
         private:
+            //! Clear progress bar
+            void clearProgressBar();
+
+            //! Stop
+            void stop() { m_stop = true; }
+
             QScopedPointer<Ui::CDbReduceModelDuplicates> ui;
+            bool m_stop = false;
             BlackMisc::Simulation::CSimulatorInfo     m_simulator;
             BlackMisc::Simulation::CAircraftModelList m_models;
             BlackMisc::Simulation::CAircraftModelList m_removeCandidates;
diff --git a/src/blackgui/components/dbreducemodelduplicates.ui b/src/blackgui/components/dbreducemodelduplicates.ui
index 28c93ea17..377b67078 100644
--- a/src/blackgui/components/dbreducemodelduplicates.ui
+++ b/src/blackgui/components/dbreducemodelduplicates.ui
@@ -124,17 +124,18 @@
              <number>0</number>
             </property>
             <item>
-             <spacer name="hs_Button">
-              <property name="orientation">
-               <enum>Qt::Horizontal</enum>
+             <widget class="QProgressBar" name="pb_Progress">
+              <property name="value">
+               <number>24</number>
               </property>
-              <property name="sizeHint" stdset="0">
-               <size>
-                <width>40</width>
-                <height>20</height>
-               </size>
+             </widget>
+            </item>
+            <item>
+             <widget class="QPushButton" name="pb_Stop">
+              <property name="text">
+               <string>stop</string>
               </property>
-             </spacer>
+             </widget>
             </item>
             <item>
              <widget class="QPushButton" name="pb_Run">
@@ -177,7 +178,7 @@
       <enum>Qt::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::Close</set>
      </property>
     </widget>
    </item>
@@ -201,8 +202,9 @@
   <tabstop>le_Distributor</tabstop>
   <tabstop>rb_SameLiveryAndAircraft</tabstop>
   <tabstop>rb_SameAirlineAndAircraft</tabstop>
-  <tabstop>tvp_RemoveModels</tabstop>
+  <tabstop>pb_Stop</tabstop>
   <tabstop>pb_Run</tabstop>
+  <tabstop>tvp_RemoveModels</tabstop>
  </tabstops>
  <resources/>
  <connections>