diff --git a/src/blackmisc/aviation/aircraftcategory.h b/src/blackmisc/aviation/aircraftcategory.h
index b0cb60f19..769021ce6 100644
--- a/src/blackmisc/aviation/aircraftcategory.h
+++ b/src/blackmisc/aviation/aircraftcategory.h
@@ -21,9 +21,9 @@
 #include "blackmisc/blackmiscexport.h"
 
 #include <QJsonObject>
-#include <QMetaType>
-#include <QString>
+#include <QMap>
 #include <QStringList>
+#include <QMetaType>
 
 namespace BlackMisc
 {
@@ -150,6 +150,10 @@ namespace BlackMisc
                 BLACK_METAMEMBER(assignable)
             );
         };
+
+        //! Category/id map
+        using AircraftCategoryIdMap = QMap<int, CAircraftCategory>;
+
     } // namespace
 } // namespace
 
diff --git a/src/blackmisc/db/datastoreobjectlist.cpp b/src/blackmisc/db/datastoreobjectlist.cpp
index a29cfd9c1..15bb48fc8 100644
--- a/src/blackmisc/db/datastoreobjectlist.cpp
+++ b/src/blackmisc/db/datastoreobjectlist.cpp
@@ -119,6 +119,18 @@ namespace BlackMisc
             return keys;
         }
 
+        template <class OBJ, class CONTAINER, typename KEYTYPE>
+        QMap<KEYTYPE, OBJ> IDatastoreObjectList<OBJ, CONTAINER, KEYTYPE>::toDbKeyValueMap() const
+        {
+            QMap<KEYTYPE, OBJ> map;
+            for (const OBJ &obj : ITimestampObjectList<OBJ, CONTAINER>::container())
+            {
+                if (!obj.hasValidDbKey()) { continue; }
+                map.insert(obj.getDbKey(), obj);
+            }
+            return map;
+        }
+
         template<class OBJ, class CONTAINER, typename KEYTYPE>
         QSet<QString> IDatastoreObjectList<OBJ, CONTAINER, KEYTYPE>::toDbKeyStringSet() const
         {
diff --git a/src/blackmisc/db/datastoreobjectlist.h b/src/blackmisc/db/datastoreobjectlist.h
index d41a470e4..f0ac6566d 100644
--- a/src/blackmisc/db/datastoreobjectlist.h
+++ b/src/blackmisc/db/datastoreobjectlist.h
@@ -16,6 +16,7 @@
 #include "blackmisc/jsonexception.h"
 #include <QJsonArray>
 #include <QSet>
+#include <QMap>
 #include <QString>
 
 namespace BlackMisc
@@ -48,6 +49,9 @@ namespace BlackMisc
             //! All keys as set
             QSet<KEYTYPE> toDbKeySet() const;
 
+            //! As map with DB key/object
+            QMap<KEYTYPE, OBJ> toDbKeyValueMap() const;
+
             //! All keys as string set (also integer keys will be converted to string)
             QSet<QString> toDbKeyStringSet() const;
 
diff --git a/src/blackmisc/simulation/aircraftmodel.cpp b/src/blackmisc/simulation/aircraftmodel.cpp
index 6f4bcfc7e..181675a8a 100644
--- a/src/blackmisc/simulation/aircraftmodel.cpp
+++ b/src/blackmisc/simulation/aircraftmodel.cpp
@@ -961,7 +961,7 @@ namespace BlackMisc
 
         CAircraftModel CAircraftModel::fromDatabaseJsonCaching(
             const QJsonObject &json,
-            AircraftIcaoIdMap &aircraftIcaos, LiveryIdMap &liveries, DistributorIdMap &distributors,
+            AircraftIcaoIdMap &aircraftIcaos, const AircraftCategoryIdMap &categories, LiveryIdMap &liveries, DistributorIdMap &distributors,
             const QString &prefix)
         {
             static const QString prefixAircraftIcao("ac_");
@@ -987,11 +987,20 @@ namespace BlackMisc
                                      distributors[idDistributor] :
                                      CDistributor::fromDatabaseJson(json, prefixDistributor));
 
-            if (!aircraftIcao.isLoadedFromDb() && idAircraftIcao >= 0) { aircraftIcao.setDbKey(idAircraftIcao); }
             if (!aircraftIcao.isLoadedFromDb() && idAircraftIcao >= 0) { aircraftIcao.setDbKey(idAircraftIcao); }
             if (!livery.isLoadedFromDb() && idLivery >= 0) { livery.setDbKey(idLivery); }
             if (!distributor.isLoadedFromDb() && !idDistributor.isEmpty()) { distributor.setDbKey(idDistributor); }
 
+            // update category
+            if (!cachedAircraftIcao)
+            {
+                const int catId = aircraftIcao.getCategory().getDbKey();
+                if (catId >= 0 && categories.contains(catId))
+                {
+                    aircraftIcao.setCategory(categories[catId]);
+                }
+            }
+
             // store in temp.cache
             if (!cachedAircraftIcao && aircraftIcao.isLoadedFromDb()) { aircraftIcaos[aircraftIcao.getDbKey()] = aircraftIcao; }
             if (!cachedLivery && livery.isLoadedFromDb()) { liveries[livery.getDbKey()] = livery; }
diff --git a/src/blackmisc/simulation/aircraftmodel.h b/src/blackmisc/simulation/aircraftmodel.h
index d067abebf..f7328b67a 100644
--- a/src/blackmisc/simulation/aircraftmodel.h
+++ b/src/blackmisc/simulation/aircraftmodel.h
@@ -503,7 +503,7 @@ namespace BlackMisc
             static CAircraftModel fromDatabaseJson(const QJsonObject &json, const QString &prefix = QString("mod_"));
 
             //! From swift DB JSON, caching during this process (faster)
-            static CAircraftModel fromDatabaseJsonCaching(const QJsonObject &json, Aviation::AircraftIcaoIdMap &aircraftIcaos, Aviation::LiveryIdMap &liveries, DistributorIdMap &distributors, const QString &prefix = QString("mod_"));
+            static CAircraftModel fromDatabaseJsonCaching(const QJsonObject &json, Aviation::AircraftIcaoIdMap &aircraftIcaos, const Aviation::AircraftCategoryIdMap &categories, Aviation::LiveryIdMap &liveries, DistributorIdMap &distributors, const QString &prefix = QString("mod_"));
 
             //! Livery string prefix
             static const QString &liveryStringPrefix();
diff --git a/src/blackmisc/simulation/aircraftmodellist.cpp b/src/blackmisc/simulation/aircraftmodellist.cpp
index 284bd1830..4386ef540 100644
--- a/src/blackmisc/simulation/aircraftmodellist.cpp
+++ b/src/blackmisc/simulation/aircraftmodellist.cpp
@@ -10,7 +10,6 @@
 #include "blackmisc/simulation/aircraftmodellist.h"
 #include "blackmisc/simulation/matchingutils.h"
 #include "blackmisc/aviation/callsign.h"
-#include "blackmisc/aviation/liverylist.h"
 #include "blackmisc/math/mathutils.h"
 #include "blackmisc/compare.h"
 #include "blackmisc/iterator.h"
@@ -1507,16 +1506,23 @@ namespace BlackMisc
             return stats;
         }
 
-        CAircraftModelList CAircraftModelList::fromDatabaseJsonCaching(const QJsonArray &array)
+        CAircraftModelList CAircraftModelList::fromDatabaseJsonCaching(
+            const QJsonArray &array,
+            const CAircraftIcaoCodeList &icaos,
+            const CAircraftCategoryList &categories,
+            const CLiveryList &liveries,
+            const CDistributorList &distributors
+        )
         {
-            AircraftIcaoIdMap aircraftIcaos;
-            LiveryIdMap       liveries;
-            DistributorIdMap  distributors;
+            AircraftIcaoIdMap aircraftIcaosMap = icaos.toDbKeyValueMap();
+            LiveryIdMap       liveriesMap = liveries.toDbKeyValueMap();
+            DistributorIdMap  distributorsMap = distributors.toDbKeyValueMap();
+            const AircraftCategoryIdMap categoriesMap = categories.toDbKeyValueMap();
 
             CAircraftModelList models;
             for (const QJsonValue &value : array)
             {
-                models.push_back(CAircraftModel::fromDatabaseJsonCaching(value.toObject(), aircraftIcaos, liveries, distributors));
+                models.push_back(CAircraftModel::fromDatabaseJsonCaching(value.toObject(), aircraftIcaosMap, categoriesMap, liveriesMap, distributorsMap));
             }
             return models;
         }
diff --git a/src/blackmisc/simulation/aircraftmodellist.h b/src/blackmisc/simulation/aircraftmodellist.h
index 0c6c34791..07352d2fa 100644
--- a/src/blackmisc/simulation/aircraftmodellist.h
+++ b/src/blackmisc/simulation/aircraftmodellist.h
@@ -17,6 +17,8 @@
 #include "blackmisc/simulation/simulatorinfo.h"
 #include "blackmisc/aviation/aircrafticaocodelist.h"
 #include "blackmisc/aviation/airlineicaocodelist.h"
+#include "blackmisc/aviation/aircraftcategorylist.h"
+#include "blackmisc/aviation/liverylist.h"
 #include "blackmisc/aviation/callsignobjectlist.h"
 #include "blackmisc/db/datastoreobjectlist.h"
 #include "blackmisc/blackmiscexport.h"
@@ -462,7 +464,11 @@ namespace BlackMisc
             QString htmlStatistics(bool aircraftStats, bool airlineStats) const;
 
             //! Newer version
-            static CAircraftModelList fromDatabaseJsonCaching(const QJsonArray &array);
+            static CAircraftModelList fromDatabaseJsonCaching(const QJsonArray &array,
+                    const Aviation::CAircraftIcaoCodeList &aircraftIcaos = {},
+                    const Aviation::CAircraftCategoryList &aircraftCategories = {},
+                    const Aviation::CLiveryList &liveries = {},
+                    const CDistributorList &distributors = {});
         };
 
         //! Model per callsign