diff --git a/src/blackcore/databasereader.cpp b/src/blackcore/databasereader.cpp
index 232ca9ca8..3cc226bd6 100644
--- a/src/blackcore/databasereader.cpp
+++ b/src/blackcore/databasereader.cpp
@@ -24,11 +24,14 @@ namespace BlackCore
         connect(&m_watchdogTimer, &QTimer::timeout, this, &CDatabaseReader::ps_watchdog);
     }
 
-    void CDatabaseReader::readInBackgroundThread(CEntityFlags::Entity entities)
+    void CDatabaseReader::readInBackgroundThread(CEntityFlags::Entity entities, const QDateTime &newerThan)
     {
         if (isAbandoned()) { return; }
         this->m_watchdogTimer.stop();
-        bool s = QMetaObject::invokeMethod(this, "ps_read", Q_ARG(BlackMisc::Network::CEntityFlags::Entity, entities));
+        // ps_read is implemented in the derived classes
+        bool s = QMetaObject::invokeMethod(this, "ps_read",
+                                           Q_ARG(BlackMisc::Network::CEntityFlags::Entity, entities),
+                                           Q_ARG(QDateTime, newerThan));
         Q_ASSERT_X(s, Q_FUNC_INFO, "Invoke failed");
         Q_UNUSED(s);
     }
@@ -63,6 +66,7 @@ namespace BlackCore
                 datastoreResponse.jsonArray = responseObject["data"].toArray();
                 QString ts(responseObject["latest"].toString());
                 datastoreResponse.updated = ts.isEmpty() ? QDateTime::currentDateTimeUtc() : CDatastoreUtility::parseTimestamp(ts);
+                datastoreResponse.restricted = responseObject["restricted"].toBool();
             }
             return datastoreResponse;
         }
diff --git a/src/blackcore/databasereader.h b/src/blackcore/databasereader.h
index befcbf2cf..f33ad189f 100644
--- a/src/blackcore/databasereader.h
+++ b/src/blackcore/databasereader.h
@@ -20,7 +20,6 @@
 #include <QDateTime>
 #include <QTimer>
 
-
 namespace BlackCore
 {
     //! Specialized version of threaded reader for DB data
@@ -32,8 +31,9 @@ namespace BlackCore
         //!  Response from our database
         struct JsonDatastoreResponse
         {
-            QJsonArray jsonArray;  //!< JSON array data
-            QDateTime updated;     //!< when updated
+            QJsonArray jsonArray;           //!< JSON array data
+            QDateTime  updated;             //!< when was the latest updated?
+            bool       restricted = false;  //!< restricted reponse, only data changed
 
             //! Any data?
             bool isEmpty() const { return jsonArray.isEmpty(); }
@@ -50,12 +50,15 @@ namespace BlackCore
             //! Is response newer?
             bool isNewer(qint64 mSecsSinceEpoch) const { return updated.toMSecsSinceEpoch() > mSecsSinceEpoch; }
 
+            //! Incremental data
+            bool isRestricted() const { return restricted; }
+
             //! Implicit conversion
             operator QJsonArray() const { return jsonArray; }
         };
 
         //! Start reading in own thread
-        void readInBackgroundThread(BlackMisc::Network::CEntityFlags::Entity entities);
+        void readInBackgroundThread(BlackMisc::Network::CEntityFlags::Entity entities, const QDateTime &newerThan);
 
         //! Can connect to DB
         //! \threadsafe
@@ -69,7 +72,7 @@ namespace BlackCore
     protected:
         BlackMisc::Network::CUrl m_watchdogUrl;              //!< URL for checking if alive
         QTimer                   m_watchdogTimer { this };   //!< Timer for watchdog (DB available?)
-        QString                  m_watchdogMessage;          //!< Returned status message
+        QString                  m_watchdogMessage;          //!< Returned status message from watchdog
         bool                     m_canConnect = false;       //!< Successful connection?
         mutable QReadWriteLock   m_watchdogLock;             //!< Lock
 
diff --git a/src/blackcore/icaodatareader.cpp b/src/blackcore/icaodatareader.cpp
index 81a6cd915..64dd29071 100644
--- a/src/blackcore/icaodatareader.cpp
+++ b/src/blackcore/icaodatareader.cpp
@@ -129,7 +129,7 @@ namespace BlackCore
         return m_countries.size();
     }
 
-    void CIcaoDataReader::ps_read(BlackMisc::Network::CEntityFlags::Entity entities)
+    void CIcaoDataReader::ps_read(BlackMisc::Network::CEntityFlags::Entity entities, const QDateTime &newerThan)
     {
         this->threadAssertCheck(); // runs in background thread
         Q_ASSERT(this->m_networkManagerAircraft);
@@ -139,9 +139,10 @@ namespace BlackCore
         CEntityFlags::Entity entitiesTriggered = CEntityFlags::NoEntity;
         if (entities.testFlag(CEntityFlags::AircraftIcaoEntity))
         {
-            QUrl url(getAircraftIcaoUrl());
+            CUrl url(getAircraftIcaoUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull()) { url.appendQuery("newer=" + newerThan.toString(Qt::ISODate)); }
                 QNetworkRequest requestAircraft(CNetworkUtils::getNetworkRequest(url));
                 this->m_networkManagerAircraft->get(requestAircraft);
                 entitiesTriggered |= CEntityFlags::AircraftIcaoEntity;
@@ -154,9 +155,10 @@ namespace BlackCore
 
         if (entities.testFlag(CEntityFlags::AirlineIcaoEntity))
         {
-            QUrl url(getAirlineIcaoUrl());
+            CUrl url(getAirlineIcaoUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull()) { url.appendQuery("newer=" + newerThan.toString(Qt::ISODate)); }
                 QNetworkRequest requestAirline(CNetworkUtils::getNetworkRequest(url));
                 this->m_networkManagerAirlines->get(requestAirline);
                 entitiesTriggered |= CEntityFlags::AirlineIcaoEntity;
@@ -169,9 +171,10 @@ namespace BlackCore
 
         if (entities.testFlag(CEntityFlags::CountryEntity))
         {
-            QUrl url(getCountryUrl());
+            CUrl url(getCountryUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull()) { url.appendQuery("newer=" + newerThan.toString(Qt::ISODate)); }
                 QNetworkRequest requestCountry(CNetworkUtils::getNetworkRequest(url));
                 this->m_networkManagerCountries->get(requestCountry);
                 entitiesTriggered |= CEntityFlags::CountryEntity;
diff --git a/src/blackcore/icaodatareader.h b/src/blackcore/icaodatareader.h
index 1a2b94a05..e172a7f4d 100644
--- a/src/blackcore/icaodatareader.h
+++ b/src/blackcore/icaodatareader.h
@@ -120,7 +120,7 @@ namespace BlackCore
         void ps_parseCountryData(QNetworkReply *nwReply);
 
         //! Read / re-read data file
-        void ps_read(BlackMisc::Network::CEntityFlags::Entity entities);
+        void ps_read(BlackMisc::Network::CEntityFlags::Entity entities, const QDateTime &newerThan);
 
     private:
         QNetworkAccessManager *m_networkManagerAircraft  = nullptr;
diff --git a/src/blackcore/modeldatareader.cpp b/src/blackcore/modeldatareader.cpp
index 3a2e8726f..62e538236 100644
--- a/src/blackcore/modeldatareader.cpp
+++ b/src/blackcore/modeldatareader.cpp
@@ -126,6 +126,18 @@ namespace BlackCore
         return m_models.size();
     }
 
+    QList<int> CModelDataReader::getModelDbKeys() const
+    {
+        QReadLocker l(&m_lockModels);
+        return m_models.toDbKeyList();
+    }
+
+    QStringList CModelDataReader::getModelStrings() const
+    {
+        QReadLocker l(&m_lockModels);
+        return m_models.getModelStrings(false);
+    }
+
     bool CModelDataReader::areAllDataRead() const
     {
         return
@@ -134,7 +146,7 @@ namespace BlackCore
             getDistributorsCount() > 0;
     }
 
-    void CModelDataReader::ps_read(CEntityFlags::Entity entity)
+    void CModelDataReader::ps_read(CEntityFlags::Entity entity, const QDateTime &newerThan)
     {
         this->threadAssertCheck();
         Q_ASSERT(this->m_networkManagerLivery);
@@ -147,6 +159,11 @@ namespace BlackCore
             CUrl url(getLiveryUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull())
+                {
+                    const QString tss(newerThan.toString(Qt::ISODate));
+                    url.appendQuery("newer=" + tss);
+                }
                 QNetworkRequest requestLivery(url);
                 CNetworkUtils::ignoreSslVerification(requestLivery);
                 this->m_networkManagerLivery->get(requestLivery);
@@ -163,6 +180,11 @@ namespace BlackCore
             CUrl url(getDistributorUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull())
+                {
+                    const QString tss(newerThan.toString(Qt::ISODate));
+                    url.appendQuery("newer=" + tss);
+                }
                 QNetworkRequest requestDistributor(url);
                 CNetworkUtils::ignoreSslVerification(requestDistributor);
                 this->m_networkManagerDistributor->get(requestDistributor);
@@ -179,6 +201,11 @@ namespace BlackCore
             CUrl url(getModelUrl());
             if (!url.isEmpty())
             {
+                if (!newerThan.isNull())
+                {
+                    const QString tss(newerThan.toString(Qt::ISODate));
+                    url.appendQuery("newer=" + tss);
+                }
                 QNetworkRequest requestModel(url);
                 CNetworkUtils::ignoreSslVerification(requestModel);
                 this->m_networkManagerModel->get(requestModel);
@@ -202,13 +229,25 @@ namespace BlackCore
         // required to use delete later as object is created in a different thread
         QScopedPointer<QNetworkReply, QScopedPointerDeleteLater> nwReply(nwReplyPtr);
         QString urlString(nwReply->url().toString());
-        QJsonArray array = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
-        if (array.isEmpty())
+        CDatabaseReader::JsonDatastoreResponse res = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
+        if (res.isEmpty())
         {
             emit dataRead(CEntityFlags::LiveryEntity, CEntityFlags::ReadFailed, 0);
             return;
         }
-        CLiveryList liveries = CLiveryList::fromDatabaseJson(array);
+
+        // get all or incremental set of distributor
+        CLiveryList liveries;
+        if (res.isRestricted())
+        {
+            // create full list if it was just incremental
+            liveries = this->getLiveries();
+            liveries.replaceOrAddObjectsByKey(CLiveryList::fromDatabaseJson(res));
+        }
+        else
+        {
+            liveries  = CLiveryList::fromDatabaseJson(res);
+        }
 
         // this part needs to be synchronized
         int n = liveries.size();
@@ -216,8 +255,10 @@ namespace BlackCore
             QWriteLocker wl(&this->m_lockLivery);
             this->m_liveries = liveries;
         }
+
         // never emit when lock is held -> deadlock
-        emit dataRead(CEntityFlags::LiveryEntity, CEntityFlags::ReadFinished, n);
+        emit dataRead(CEntityFlags::LiveryEntity,
+                      res.isRestricted() ? CEntityFlags::ReadFinishedRestricted : CEntityFlags::ReadFinished, n);
         CLogMessage(this).info("Read %1 %2 from %3") << n << CEntityFlags::flagToString(CEntityFlags::LiveryEntity) << urlString;
     }
 
@@ -225,13 +266,25 @@ namespace BlackCore
     {
         QScopedPointer<QNetworkReply, QScopedPointerDeleteLater> nwReply(nwReplyPtr);
         QString urlString(nwReply->url().toString());
-        QJsonArray array = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
-        if (array.isEmpty())
+        CDatabaseReader::JsonDatastoreResponse res = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
+        if (res.isEmpty())
         {
             emit dataRead(CEntityFlags::DistributorEntity, CEntityFlags::ReadFailed, 0);
             return;
         }
-        CDistributorList distributors = CDistributorList::fromDatabaseJson(array);
+
+        // get all or incremental set of distributor
+        CDistributorList distributors;
+        if (res.isRestricted())
+        {
+            // create full list if it was just incremental
+            distributors = this->getDistributors();
+            distributors.replaceOrAddObjectsByKey(CDistributorList::fromDatabaseJson(res));
+        }
+        else
+        {
+            distributors = CDistributorList::fromDatabaseJson(res);
+        }
 
         // this part needs to be synchronized
         int n = distributors.size();
@@ -239,7 +292,8 @@ namespace BlackCore
             QWriteLocker wl(&this->m_lockDistributor);
             this->m_distributors = distributors;
         }
-        emit dataRead(CEntityFlags::DistributorEntity, CEntityFlags::ReadFinished, n);
+        emit dataRead(CEntityFlags::DistributorEntity,
+                      res.isRestricted() ? CEntityFlags::ReadFinishedRestricted : CEntityFlags::ReadFinished, n);
         CLogMessage(this).info("Read %1 %2 from %3") << n << CEntityFlags::flagToString(CEntityFlags::DistributorEntity) << urlString;
     }
 
@@ -247,21 +301,35 @@ namespace BlackCore
     {
         QScopedPointer<QNetworkReply, QScopedPointerDeleteLater> nwReply(nwReplyPtr);
         QString urlString(nwReply->url().toString());
-        QJsonArray array = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
-        if (array.isEmpty())
+        CDatabaseReader::JsonDatastoreResponse res = this->setStatusAndTransformReplyIntoDatastoreResponse(nwReply.data());
+        if (res.isEmpty())
         {
             emit dataRead(CEntityFlags::ModelEntity, CEntityFlags::ReadFailed, 0);
             return;
         }
-        CAircraftModelList models = CAircraftModelList::fromDatabaseJson(array);
 
-        // this part needs to be synchronized
+        // get all or incremental set of models
+        CAircraftModelList models;
+        if (res.isRestricted())
+        {
+            // create full list if it was just incremental
+            models = this->getModels();
+            models.replaceOrAddObjectsByKey(CAircraftModelList::fromDatabaseJson(res));
+        }
+        else
+        {
+            models = CAircraftModelList::fromDatabaseJson(res);
+        }
+
+        // syncronized update
         int n = models.size();
         {
             QWriteLocker wl(&this->m_lockModels);
             this->m_models = models;
         }
-        emit dataRead(CEntityFlags::ModelEntity, CEntityFlags::ReadFinished, n);
+
+        emit dataRead(CEntityFlags::ModelEntity,
+                      res.isRestricted() ? CEntityFlags::ReadFinishedRestricted : CEntityFlags::ReadFinished, n);
         CLogMessage(this).info("Read %1 %2 from %3") << n << CEntityFlags::flagToString(CEntityFlags::ModelEntity) << urlString;
     }
 
diff --git a/src/blackcore/modeldatareader.h b/src/blackcore/modeldatareader.h
index a5dbc0676..e500c22e5 100644
--- a/src/blackcore/modeldatareader.h
+++ b/src/blackcore/modeldatareader.h
@@ -88,6 +88,14 @@ namespace BlackCore
         //! \threadsafe
         int getModelsCount() const;
 
+        //! Get model keys
+        //! \threadsafe
+        QList<int> getModelDbKeys() const;
+
+        //! Get model keys
+        //! \threadsafe
+        QStringList getModelStrings() const;
+
         //! All data read?
         //! \threadsafe
         bool areAllDataRead() const;
@@ -116,7 +124,7 @@ namespace BlackCore
         void ps_parseModelData(QNetworkReply *nwReply);
 
         //! Read / re-read data file
-        void ps_read(BlackMisc::Network::CEntityFlags::Entity entity = BlackMisc::Network::CEntityFlags::DistributorLiveryModel);
+        void ps_read(BlackMisc::Network::CEntityFlags::Entity entity = BlackMisc::Network::CEntityFlags::DistributorLiveryModel, const QDateTime &newerThan = QDateTime());
 
     private:
         QNetworkAccessManager *m_networkManagerLivery = nullptr;
diff --git a/src/blackcore/webdataservices.cpp b/src/blackcore/webdataservices.cpp
index 080714877..bedead8d7 100644
--- a/src/blackcore/webdataservices.cpp
+++ b/src/blackcore/webdataservices.cpp
@@ -177,7 +177,7 @@ namespace BlackCore
         return false;
     }
 
-    CEntityFlags::Entity CWebDataServices::triggerRead(CEntityFlags::Entity whatToRead)
+    CEntityFlags::Entity CWebDataServices::triggerRead(CEntityFlags::Entity whatToRead, const QDateTime &newerThan)
     {
         m_initialRead = true;
         CEntityFlags::Entity triggeredRead = CEntityFlags::NoEntity;
@@ -213,7 +213,7 @@ namespace BlackCore
             if (whatToRead.testFlag(CEntityFlags::AircraftIcaoEntity) || whatToRead.testFlag(CEntityFlags::AirlineIcaoEntity) || whatToRead.testFlag(CEntityFlags::CountryEntity))
             {
                 CEntityFlags::Entity icaoEntities = whatToRead & CEntityFlags::AllIcaoAndCountries;
-                m_icaoDataReader->readInBackgroundThread(icaoEntities);
+                m_icaoDataReader->readInBackgroundThread(icaoEntities, newerThan);
                 triggeredRead |= icaoEntities;
             }
         }
@@ -223,7 +223,7 @@ namespace BlackCore
             if (whatToRead.testFlag(CEntityFlags::LiveryEntity) || whatToRead.testFlag(CEntityFlags::DistributorEntity) || whatToRead.testFlag(CEntityFlags::ModelEntity))
             {
                 CEntityFlags::Entity modelEntities = whatToRead & CEntityFlags::DistributorLiveryModel;
-                m_modelDataReader->readInBackgroundThread(modelEntities);
+                m_modelDataReader->readInBackgroundThread(modelEntities, newerThan);
                 triggeredRead |= modelEntities;
             }
         }
@@ -296,6 +296,18 @@ namespace BlackCore
         return 0;
     }
 
+    QList<int> CWebDataServices::getModelDbKeys() const
+    {
+        if (m_modelDataReader) { return m_modelDataReader->getModelDbKeys(); }
+        return QList<int>();
+    }
+
+    QStringList CWebDataServices::getModelStrings() const
+    {
+        if (m_modelDataReader) { return m_modelDataReader->getModelStrings(); }
+        return QStringList();
+    }
+
     CAircraftModelList CWebDataServices::getModelsForAircraftDesignatorAndLiveryCombinedCode(const QString &aircraftDesignator, const QString &combinedCode) const
     {
         if (m_modelDataReader) { return m_modelDataReader->getModelsForAircraftDesignatorAndLiveryCombinedCode(aircraftDesignator, combinedCode); }
diff --git a/src/blackcore/webdataservices.h b/src/blackcore/webdataservices.h
index 01a1af0c0..8345271ce 100644
--- a/src/blackcore/webdataservices.h
+++ b/src/blackcore/webdataservices.h
@@ -91,7 +91,7 @@ namespace BlackCore
 
         //! \copydoc BlackMisc::Network::IWebDataServicesProvider::triggerRead
         //! \ingroup webdatareaderprovider
-        virtual BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead) override;
+        virtual BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead, const QDateTime &newerThan = QDateTime()) override;
 
         //! \copydoc BlackMisc::Network::IWebDataServicesProvider::getVatsimFsdServers
         //! \ingroup webdatareaderprovider
@@ -145,6 +145,14 @@ namespace BlackCore
         //! \ingroup webdatareaderprovider
         virtual int getModelsCount() const override;
 
+        //! \copydoc BlackMisc::Network::IWebDataServicesProvider::getModelDbKeys
+        //! \ingroup webdatareaderprovider
+        virtual QList<int> getModelDbKeys() const override;
+
+        //! \copydoc BlackMisc::Network::IWebDataServicesProvider::getModelStrings
+        //! \ingroup webdatareaderprovider
+        virtual QStringList getModelStrings() const override;
+
         //! \copydoc BlackMisc::Network::IWebDataServicesProvider::getModelsForAircraftDesignatorAndLiveryCombinedCode
         //! \ingroup webdatareaderprovider
         virtual BlackMisc::Simulation::CAircraftModelList getModelsForAircraftDesignatorAndLiveryCombinedCode(const QString &aircraftDesignator, const QString &combinedCode) const override;
diff --git a/src/blackgui/components/dbmodelcomponent.cpp b/src/blackgui/components/dbmodelcomponent.cpp
index 8ae39b78c..6847e99b2 100644
--- a/src/blackgui/components/dbmodelcomponent.cpp
+++ b/src/blackgui/components/dbmodelcomponent.cpp
@@ -60,9 +60,12 @@ namespace BlackGui
         void CDbModelComponent::ps_modelsRead(CEntityFlags::Entity entity, CEntityFlags::ReadState readState, int count)
         {
             Q_UNUSED(count);
-            if (entity.testFlag(CEntityFlags::ModelEntity) && readState == CEntityFlags::ReadFinished)
+            if (entity.testFlag(CEntityFlags::ModelEntity))
             {
-                this->ui->tvp_AircraftModel->updateContainer(this->getModels());
+                if (readState == CEntityFlags::ReadFinished || readState == CEntityFlags::ReadFinishedRestricted)
+                {
+                    this->ui->tvp_AircraftModel->updateContainer(this->getModels());
+                }
             }
         }
 
diff --git a/src/blackmisc/network/entityflags.cpp b/src/blackmisc/network/entityflags.cpp
index f11a2bbac..1bf7a40fd 100644
--- a/src/blackmisc/network/entityflags.cpp
+++ b/src/blackmisc/network/entityflags.cpp
@@ -11,6 +11,7 @@
 #include "blackmisc/dbus.h"
 #include <QtDBus/QDBusMetaType>
 #include <QStringList>
+#include "blackmisc/verify.h"
 
 namespace BlackMisc
 {
@@ -33,7 +34,7 @@ namespace BlackMisc
             case AllIcaoAndCountries: return "All ICAO + country";
             case AllEntities: return "All";
             default:
-                Q_ASSERT_X(false, Q_FUNC_INFO, "wrong flags");
+                BLACK_VERIFY_X(false, Q_FUNC_INFO, "wrong flags");
                 return "wrong flags";
             }
         }
@@ -58,10 +59,11 @@ namespace BlackMisc
             switch (flag)
             {
             case ReadFinished: return "finished";
+            case ReadFinishedRestricted: return "finished (restricted)";
             case ReadFailed: return "failed";
             case StartRead: return "read started";
             default:
-                Q_ASSERT_X(false, Q_FUNC_INFO, "wrong flags");
+                BLACK_VERIFY_X(false, Q_FUNC_INFO, "wrong flags");
                 return "wrong flags";
             }
         }
@@ -71,18 +73,22 @@ namespace BlackMisc
             switch (state)
             {
             case ReadFinished:
+            case ReadFinishedRestricted:
             case StartRead:
-            default:
                 return CStatusMessage::SeverityInfo;
             case ReadFailed:
                 return CStatusMessage::SeverityWarning;
+            default:
+                Q_ASSERT_X(false, Q_FUNC_INFO, "Missing state");
+                return CStatusMessage::SeverityInfo;
             }
         }
 
         bool CEntityFlags::isWarningOrAbove(CEntityFlags::ReadState state)
         {
             CStatusMessage::StatusSeverity s = flagToSeverity(state);
-            switch (s) {
+            switch (s)
+            {
             case CStatusMessage::SeverityError:
             case CStatusMessage::SeverityWarning:
                 return true;
diff --git a/src/blackmisc/network/entityflags.h b/src/blackmisc/network/entityflags.h
index f7d014e91..1045ce6b0 100644
--- a/src/blackmisc/network/entityflags.h
+++ b/src/blackmisc/network/entityflags.h
@@ -49,9 +49,10 @@ namespace BlackMisc
             //! State of operation
             enum ReadState
             {
-                StartRead,    ///< reading has been started
-                ReadFinished, ///< reading done
-                ReadFailed    ///< reading failed
+                StartRead,                ///< reading has been started
+                ReadFinished,             ///< reading done
+                ReadFinishedRestricted,   ///< finished a timestamp restricted read
+                ReadFailed                ///< reading failed
             };
 
             //! Convert to string
diff --git a/src/blackmisc/network/webdataservicesprovider.cpp b/src/blackmisc/network/webdataservicesprovider.cpp
index f2df65492..1b73ae68f 100644
--- a/src/blackmisc/network/webdataservicesprovider.cpp
+++ b/src/blackmisc/network/webdataservicesprovider.cpp
@@ -129,6 +129,20 @@ namespace BlackMisc
             return this->m_webDataReaderProvider->getModelsCount();
         }
 
+        QList<int> CWebDataServicesAware::getModelDbKeys() const
+        {
+            Q_ASSERT_X(this->m_webDataReaderProvider, Q_FUNC_INFO, "Missing provider");
+            if (!hasProvider()) { return QList<int>(); }
+            return this->m_webDataReaderProvider->getModelDbKeys();
+        }
+
+        QStringList CWebDataServicesAware::getModelStrings() const
+        {
+            Q_ASSERT_X(this->m_webDataReaderProvider, Q_FUNC_INFO, "Missing provider");
+            if (!hasProvider()) { return QStringList(); }
+            return this->m_webDataReaderProvider->getModelStrings();
+        }
+
         CAircraftModel CWebDataServicesAware::getModelForModelString(const QString &modelString) const
         {
             Q_ASSERT_X(this->m_webDataReaderProvider, Q_FUNC_INFO, "Missing provider");
@@ -306,11 +320,11 @@ namespace BlackMisc
             }
         }
 
-        CEntityFlags::Entity CWebDataServicesAware::triggerRead(CEntityFlags::Entity whatToRead)
+        CEntityFlags::Entity CWebDataServicesAware::triggerRead(CEntityFlags::Entity whatToRead, const QDateTime &newerThan)
         {
             Q_ASSERT_X(this->m_webDataReaderProvider, Q_FUNC_INFO, "Missing provider");
             if (!hasProvider()) { return CEntityFlags::NoEntity; }
-            return this->m_webDataReaderProvider->triggerRead(whatToRead);
+            return this->m_webDataReaderProvider->triggerRead(whatToRead, newerThan);
         }
 
         bool CWebDataServicesAware::canConnectSwiftDb() const
diff --git a/src/blackmisc/network/webdataservicesprovider.h b/src/blackmisc/network/webdataservicesprovider.h
index 996d09031..50bb1f457 100644
--- a/src/blackmisc/network/webdataservicesprovider.h
+++ b/src/blackmisc/network/webdataservicesprovider.h
@@ -112,6 +112,14 @@ namespace BlackMisc
             //! \threadsafe
             virtual int getModelsCount() const = 0;
 
+            //! Model keys
+            //! \threadsafe
+            virtual QList<int> getModelDbKeys() const = 0;
+
+            //! Model strings
+            //! \threadsafe
+            virtual QStringList getModelStrings() const = 0;
+
             //! Models for combined code and aircraft designator
             //! \threadsafe
             virtual BlackMisc::Simulation::CAircraftModelList getModelsForAircraftDesignatorAndLiveryCombinedCode(const QString &aircraftDesignator, const QString &combinedCode) const = 0;
@@ -204,7 +212,7 @@ namespace BlackMisc
                 std::function<void(const BlackMisc::Simulation::CAircraftModelList &, const BlackMisc::Simulation::CAircraftModelList &, const BlackMisc::CStatusMessageList &)> dataPublished) = 0;
 
             //! Trigger read of new data
-            virtual BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead) = 0;
+            virtual BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead, const QDateTime &dateTime = QDateTime()) = 0;
 
             //! Can connect to swift DB?
             virtual bool canConnectSwiftDb() const = 0;
@@ -276,6 +284,12 @@ namespace BlackMisc
             //! \copydoc IWebDataServicesProvider::getModelsCount
             int getModelsCount() const;
 
+            //! \copydoc IWebDataServicesProvider::getModelDbKeys
+            QList<int> getModelDbKeys() const;
+
+            //! \copydoc IWebDataServicesProvider::getModelStrings
+            QStringList getModelStrings() const;
+
             //! \copydoc IWebDataServicesProvider::getModelsForAircraftDesignatorAndLiveryCombinedCode
             BlackMisc::Simulation::CAircraftModelList getModelsForAircraftDesignatorAndLiveryCombinedCode(const QString &aircraftDesignator, const QString &combinedCode) const;
 
@@ -353,7 +367,7 @@ namespace BlackMisc
                 std::function<void(const BlackMisc::Simulation::CAircraftModelList &, const BlackMisc::Simulation::CAircraftModelList &, const BlackMisc::CStatusMessageList &)> dataPublished);
 
             //! \copydoc IWebDataServicesProvider::triggerRead
-            BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead);
+            BlackMisc::Network::CEntityFlags::Entity triggerRead(BlackMisc::Network::CEntityFlags::Entity whatToRead, const QDateTime &newerThan);
 
             //! \copydoc IWebDataServicesProvider::canConnectSwiftDb
             bool canConnectSwiftDb() const;
diff --git a/tests/blackcore/testreaders.cpp b/tests/blackcore/testreaders.cpp
index 388a01ae2..e5d8a052f 100644
--- a/tests/blackcore/testreaders.cpp
+++ b/tests/blackcore/testreaders.cpp
@@ -36,7 +36,7 @@ namespace BlackCoreTest
         m_icaoReader.start();
         Expect e(&this->m_icaoReader);
         EXPECT_UNIT(e)
-        .send(&CIcaoDataReader::readInBackgroundThread, CEntityFlags::AllIcaoEntities)
+        .send(&CIcaoDataReader::readInBackgroundThread, CEntityFlags::AllIcaoEntities, QDateTime())
         .expect(&CIcaoDataReader::dataRead, [url]()
         {
             qDebug() << "Read ICAO data from" << url.getFullUrl();
@@ -59,7 +59,7 @@ namespace BlackCoreTest
         m_modelReader.start();
         Expect e(&this->m_modelReader);
         EXPECT_UNIT(e)
-        .send(&CModelDataReader::readInBackgroundThread, CEntityFlags::AllIcaoEntities)
+        .send(&CModelDataReader::readInBackgroundThread, CEntityFlags::DistributorLiveryModel, QDateTime())
         .expect(&CModelDataReader::dataRead, [url]()
         {
             qDebug() << "Read model data " << url;