diff --git a/src/blackmisc/simulation/aircraftmodel.cpp b/src/blackmisc/simulation/aircraftmodel.cpp
index 079d56b2a..7aaef3506 100644
--- a/src/blackmisc/simulation/aircraftmodel.cpp
+++ b/src/blackmisc/simulation/aircraftmodel.cpp
@@ -109,6 +109,28 @@ namespace BlackMisc
             return QJsonDocument(this->toDatabaseJson()).toJson(format);
         }
 
+        QJsonObject CAircraftModel::toMemoizedJson(MemoHelper::CMemoizer &helper) const
+        {
+            QJsonObject json;
+            auto meta = introspect<CAircraftModel>().without(MetaFlags<DisabledForJson>());
+            meta.forEachMemberName(*this, [ & ](const auto & member, CExplicitLatin1String name)
+            {
+                auto &&maybeMemo = helper.maybeMemoize(member);
+                json << std::make_pair(name.toJsonKey(), std::cref(maybeMemo));
+            });
+            return json;
+        }
+
+        void CAircraftModel::convertFromMemoizedJson(const QJsonObject &json, const MemoHelper::CUnmemoizer &helper)
+        {
+            auto meta = introspect<CAircraftModel>().without(MetaFlags<DisabledForJson>());
+            meta.forEachMemberName(*this, [ & ](auto & member, CExplicitLatin1String name)
+            {
+                auto it = json.find(name);
+                if (it != json.end()) { it.value() >> helper.maybeUnmemoize(member).get(); }
+            });
+        }
+
         QString CAircraftModel::asHtmlSummary() const
         {
             const QString html = "Model: %1<br>Aircraft ICAO: %2<br>Livery: %3";
diff --git a/src/blackmisc/simulation/aircraftmodel.h b/src/blackmisc/simulation/aircraftmodel.h
index 603db2a17..541ae7dad 100644
--- a/src/blackmisc/simulation/aircraftmodel.h
+++ b/src/blackmisc/simulation/aircraftmodel.h
@@ -19,6 +19,7 @@
 #include "blackmisc/blackmiscexport.h"
 #include "blackmisc/db/datastore.h"
 #include "blackmisc/dictionary.h"
+#include "blackmisc/memotable.h"
 #include "blackmisc/metaclass.h"
 #include "blackmisc/metaclassprivate.h"
 #include "blackmisc/orderable.h"
@@ -340,6 +341,15 @@ namespace BlackMisc
             //! Validate
             BlackMisc::CStatusMessageList validate(bool withNestedObjects) const;
 
+            //! Helper class used by implementation.
+            using MemoHelper = CMemoHelper<Aviation::CAircraftIcaoCode, Aviation::CLivery, CDistributor>;
+
+            //! To JSON with memoized members (used by CAircraftModelList)
+            QJsonObject toMemoizedJson(MemoHelper::CMemoizer &) const;
+
+            //! From JSON with memoized members (used by CAircraftModelList)
+            void convertFromMemoizedJson(const QJsonObject &json, const MemoHelper::CUnmemoizer &);
+
             //! To database JSON
             QJsonObject toDatabaseJson() const;
 
diff --git a/src/blackmisc/simulation/aircraftmodellist.cpp b/src/blackmisc/simulation/aircraftmodellist.cpp
index 7fb4688fe..59a3a1064 100644
--- a/src/blackmisc/simulation/aircraftmodellist.cpp
+++ b/src/blackmisc/simulation/aircraftmodellist.cpp
@@ -13,7 +13,6 @@
 #include "blackmisc/aviation/livery.h"
 #include "blackmisc/compare.h"
 #include "blackmisc/iterator.h"
-#include "blackmisc/metaclassprivate.h"
 #include "blackmisc/range.h"
 #include "blackmisc/statusmessage.h"
 
@@ -614,6 +613,38 @@ namespace BlackMisc
             return msgs;
         }
 
+        QJsonObject CAircraftModelList::toMemoizedJson() const
+        {
+            CAircraftModel::MemoHelper::CMemoizer helper;
+            QJsonArray array;
+            for (auto it = cbegin(); it != cend(); ++it)
+            {
+                array << it->toMemoizedJson(helper);
+            }
+            QJsonObject json;
+            json.insert("containerbase", array);
+            json.insert("aircraftIcaos", helper.getTable<CAircraftIcaoCode>().toJson());
+            json.insert("liveries", helper.getTable<CLivery>().toJson());
+            json.insert("distributors", helper.getTable<CDistributor>().toJson());
+            return json;
+        }
+
+        void CAircraftModelList::convertFromMemoizedJson(const QJsonObject &json)
+        {
+            clear();
+            QJsonArray array = json.value("containerbase").toArray();
+            CAircraftModel::MemoHelper::CUnmemoizer helper;
+            helper.getTable<CAircraftIcaoCode>().convertFromJson(json.value("aircraftIcaos").toObject());
+            helper.getTable<CLivery>().convertFromJson(json.value("liveries").toObject());
+            helper.getTable<CDistributor>().convertFromJson(json.value("distributors").toObject());
+            for (auto i = array.begin(); i != array.end(); ++i)
+            {
+                CAircraftModel value;
+                value.convertFromMemoizedJson(i->toObject(), helper);
+                insert(value);
+            }
+        }
+
         QJsonArray CAircraftModelList::toDatabaseJson() const
         {
             QJsonArray array;
diff --git a/src/blackmisc/simulation/aircraftmodellist.h b/src/blackmisc/simulation/aircraftmodellist.h
index ea3f49a58..245a6959e 100644
--- a/src/blackmisc/simulation/aircraftmodellist.h
+++ b/src/blackmisc/simulation/aircraftmodellist.h
@@ -216,6 +216,12 @@ namespace BlackMisc
             //! Validate distributors
             CStatusMessageList validateDistributors(const BlackMisc::Simulation::CDistributorList &distributors, CAircraftModelList &validModels, CAircraftModelList &invalidModels) const;
 
+            //! To compact JSON format
+            QJsonObject toMemoizedJson() const;
+
+            //! From compact JSON format
+            void convertFromMemoizedJson(const QJsonObject &json);
+
             //! To database JSON
             QJsonArray toDatabaseJson() const;