diff --git a/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp b/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
index 3e29d878c..b73bdf741 100644
--- a/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
+++ b/src/plugins/simulator/xplane/xswiftbustrafficproxy.cpp
@@ -159,13 +159,19 @@ namespace BlackSimPlugin
                 if (!reply.isError())
                 {
                     const QStringList callsigns = reply.argumentAt<0>();
-                    const QList<double> latitudesDeg = reply.argumentAt<1>();
+                    const QList<double> latitudesDeg  = reply.argumentAt<1>();
                     const QList<double> longitudesDeg = reply.argumentAt<2>();
-                    const QList<double> elevationsM = reply.argumentAt<3>();
-                    const QList<bool> waterFlags = reply.argumentAt<4>();
+                    const QList<double> elevationsM   = reply.argumentAt<3>();
+                    const QList<bool>   waterFlags    = reply.argumentAt<4>();
                     const QList<double> verticalOffsets = reply.argumentAt<5>();
+
                     setter(callsigns, latitudesDeg, longitudesDeg, elevationsM, waterFlags, verticalOffsets);
                 }
+                else
+                {
+                    const QString errorMsg = reply.error().message();
+                    CLogMessage(this).warning(u"XSwiftBus DBus error getRemoteAircraftData: %1") << errorMsg;
+                }
                 watcher->deleteLater();
             };
             m_dbusInterface->callDBusAsync(QLatin1String("getRemoteAircraftData"), callback, callsigns);
diff --git a/src/xswiftbus/dbusmessage.cpp b/src/xswiftbus/dbusmessage.cpp
index 1f695b8c8..0523348d8 100644
--- a/src/xswiftbus/dbusmessage.cpp
+++ b/src/xswiftbus/dbusmessage.cpp
@@ -109,6 +109,24 @@ namespace XSwiftBus
         dbus_message_iter_append_basic(&m_messageIterator, DBUS_TYPE_DOUBLE, &value);
     }
 
+    void CDBusMessage::appendArgument(const std::vector<bool> &array)
+    {
+        // array.data() not existing for bool
+        // changing dbus_message_iter_open_container here affects DBus signature
+        // using int16 creates signature "n", mismatch on swift side
+        // using int32 creates signature "i"
+        // there are also xml files for the signature: src/xswiftbus/org.swift_project.xswiftbus.traffic.xml
+        // discussion: https://discordapp.com/channels/539048679160676382/539925070550794240/698552502831939676
+
+        DBusMessageIter arrayIterator;
+        dbus_message_iter_open_container(&m_messageIterator, DBUS_TYPE_ARRAY, DBUS_TYPE_BOOLEAN_AS_STRING, &arrayIterator);
+
+        const std::vector<unsigned> ints(array.begin(), array.end());
+        const unsigned *ptr = ints.data();
+        dbus_message_iter_append_fixed_array(&arrayIterator, DBUS_TYPE_BOOLEAN, &ptr, static_cast<int>(array.size()));
+        dbus_message_iter_close_container(&m_messageIterator, &arrayIterator);
+    }
+
     void CDBusMessage::appendArgument(const std::vector<double> &array)
     {
         DBusMessageIter arrayIterator;
diff --git a/src/xswiftbus/dbusmessage.h b/src/xswiftbus/dbusmessage.h
index 8b6b61028..a14c73dc3 100644
--- a/src/xswiftbus/dbusmessage.h
+++ b/src/xswiftbus/dbusmessage.h
@@ -76,6 +76,7 @@ namespace XSwiftBus
         void appendArgument(const std::string &value);
         void appendArgument(int value);
         void appendArgument(double value);
+        void appendArgument(const std::vector<bool> &array);
         void appendArgument(const std::vector<double> &array);
         void appendArgument(const std::vector<std::string> &array);
         //! @}
diff --git a/src/xswiftbus/traffic.cpp b/src/xswiftbus/traffic.cpp
index bb5b639e8..538648428 100644
--- a/src/xswiftbus/traffic.cpp
+++ b/src/xswiftbus/traffic.cpp
@@ -498,6 +498,7 @@ namespace XSwiftBus
         longitudesDeg.clear();
         elevationsM.clear();
         verticalOffsets.clear();
+        waterFlags.clear();
 
         for (const auto &requestedCallsign : requestedCallsigns)
         {
@@ -800,7 +801,7 @@ namespace XSwiftBus
                     std::vector<double> latitudesDeg;
                     std::vector<double> longitudesDeg;
                     std::vector<double> elevationsM;
-                    std::vector<bool> waterFlags;
+                    std::vector<bool>   waterFlags;
                     std::vector<double> verticalOffsets;
                     getRemoteAircraftData(callsigns, latitudesDeg, longitudesDeg, elevationsM, waterFlags, verticalOffsets);
                     CDBusMessage reply = CDBusMessage::createReply(sender, serial);
@@ -809,6 +810,7 @@ namespace XSwiftBus
                     reply.appendArgument(latitudesDeg);
                     reply.appendArgument(longitudesDeg);
                     reply.appendArgument(elevationsM);
+                    reply.appendArgument(waterFlags);
                     reply.appendArgument(verticalOffsets);
                     sendDBusMessage(reply);
                 });