diff --git a/src/blackmisc/simulation/fscommon/fscommonutil.cpp b/src/blackmisc/simulation/fscommon/fscommonutil.cpp
index 1e7c3f731..66515b885 100644
--- a/src/blackmisc/simulation/fscommon/fscommonutil.cpp
+++ b/src/blackmisc/simulation/fscommon/fscommonutil.cpp
@@ -205,6 +205,12 @@ namespace BlackMisc
                 return dir;
             }
 
+            QString CFsCommonUtil::p3dSimObjectsDirFromSimDir(const QString &simDir)
+            {
+                if (simDir.isEmpty()) { return QStringLiteral(""); }
+                return CFileUtils::appendFilePaths(simDir, "SimObjects");
+            }
+
             const QStringList &CFsCommonUtil::p3dSimObjectsExcludeDirectoryPatterns()
             {
                 static const QStringList exclude
diff --git a/src/blackmisc/simulation/fscommon/fscommonutil.h b/src/blackmisc/simulation/fscommon/fscommonutil.h
index f37ca2517..c7b32ea1e 100644
--- a/src/blackmisc/simulation/fscommon/fscommonutil.h
+++ b/src/blackmisc/simulation/fscommon/fscommonutil.h
@@ -61,6 +61,9 @@ namespace BlackMisc
                 //! P3D's sim object dir, resolved from multiple sources
                 static const QString &p3dSimObjectsDir();
 
+                //! P3D aircraft dir, relative to simulator directory
+                static QString p3dSimObjectsDirFromSimDir(const QString &simDir);
+
                 //! Exclude directories for simObjects
                 static const QStringList &p3dSimObjectsExcludeDirectoryPatterns();
 
diff --git a/src/blackmisc/simulation/xplane/xplaneutil.cpp b/src/blackmisc/simulation/xplane/xplaneutil.cpp
index 2b6236e80..3d4288803 100644
--- a/src/blackmisc/simulation/xplane/xplaneutil.cpp
+++ b/src/blackmisc/simulation/xplane/xplaneutil.cpp
@@ -101,25 +101,38 @@ namespace BlackMisc
 #endif
             }
 
-            QString CXPlaneUtil::xplaneRootDir()
+            const QString &CXPlaneUtil::xplaneRootDir()
             {
-                if (!xplane11Dir().isEmpty()) { return xplane11Dir(); }
-                else if (!xplane10Dir().isEmpty()) { return xplane10Dir(); }
-                else if (!xplane9Dir().isEmpty()) { return xplane9Dir(); }
-                else { return {}; }
+                static const QString dir = []
+                {
+                    if (!xplane11Dir().isEmpty()) { return xplane11Dir(); }
+                    else if (!xplane10Dir().isEmpty()) { return xplane10Dir(); }
+                    else if (!xplane9Dir().isEmpty()) { return xplane9Dir(); }
+                    else { return QString(); }
+                }();
+                return dir;
             }
 
             bool CXPlaneUtil::isXplaneRootDirExisting()
             {
-                const QDir dir(xplaneRootDir());
-                return dir.exists();
+                static const bool exists = QDir(xplaneRootDir()).exists();
+                return exists;
             }
 
-            QString CXPlaneUtil::xplanePluginDir()
+            const QString &CXPlaneUtil::xplanePluginDir()
             {
-                const QString xp = xplaneRootDir();
-                if (xp.isEmpty()) { return xp; }
-                return CFileUtils::appendFilePaths(xp, xplanePluginPath());
+                static const QString pd(xplaneRootDir().isEmpty() ? "" : CFileUtils::appendFilePaths(xplaneRootDir(), xplanePluginPath()));
+                return pd;
+            }
+
+            QString CXPlaneUtil::pluginDirFromSimDir(const QString &simulatorDir)
+            {
+                return CFileUtils::appendFilePaths(simulatorDir, xplanePluginPath());
+            }
+
+            QStringList CXPlaneUtil::modelDirectoriesFromSimDir(const QString &simulatorDir)
+            {
+                return QStringList({ simulatorDir });
             }
 
             QString CXPlaneUtil::xplanePluginPath()
@@ -130,19 +143,20 @@ namespace BlackMisc
 
             bool CXPlaneUtil::isXplanePluginDirDirExisting()
             {
-                const QDir dir(xplanePluginDir());
-                return dir.exists();
+                static const bool exists = QDir(xplanePluginDir()).exists();
+                return exists;
             }
 
-            QStringList CXPlaneUtil::xplaneModelDirectories()
+            const QStringList &CXPlaneUtil::xplaneModelDirectories()
             {
-                if (xplaneRootDir().isEmpty()) { return QStringList(); }
-                return QStringList({ xplaneRootDir() });
+                static const QStringList dirs = xplaneRootDir().isEmpty() ? QStringList() : QStringList({xplaneRootDir()});
+                return dirs;
             }
 
-            QStringList CXPlaneUtil::xplaneModelExcludeDirectoryPatterns()
+            const QStringList &CXPlaneUtil::xplaneModelExcludeDirectoryPatterns()
             {
-                return QStringList();
+                static const QStringList empty;
+                return empty;
             }
 
             QString CXPlaneUtil::xswiftbusLegacyDir(const QString &rootDir)
diff --git a/src/blackmisc/simulation/xplane/xplaneutil.h b/src/blackmisc/simulation/xplane/xplaneutil.h
index e88ab1389..12e1fbce8 100644
--- a/src/blackmisc/simulation/xplane/xplaneutil.h
+++ b/src/blackmisc/simulation/xplane/xplaneutil.h
@@ -40,14 +40,20 @@ namespace BlackMisc
 
                 //! XPlane root directory
                 //! In case more then one XPlane version is found, the path to the highest version is used
-                static QString xplaneRootDir();
+                static const QString &xplaneRootDir();
 
                 //! Is the xplaneRootDir existing?
                 static bool isXplaneRootDirExisting();
 
                 //! XPlane plugin directory
                 //! In case more then one XPlane version is found, the path to the highest version is used
-                static QString xplanePluginDir();
+                static const QString &xplanePluginDir();
+
+                //! Plugin directory from given simulator directory
+                static QString pluginDirFromSimDir(const QString &simulatorDir);
+
+                //! Model directories from simultaor directory
+                static QStringList modelDirectoriesFromSimDir(const QString &simulatorDir);
 
                 //! XPlane relative plugin path
                 static QString xplanePluginPath();
@@ -56,10 +62,10 @@ namespace BlackMisc
                 static bool isXplanePluginDirDirExisting();
 
                 //! Directories with models
-                static QStringList xplaneModelDirectories();
+                static const QStringList &xplaneModelDirectories();
 
                 //! Exclude directories for models
-                static QStringList xplaneModelExcludeDirectoryPatterns();
+                static const QStringList &xplaneModelExcludeDirectoryPatterns();
 
                 //! XSwiftBus legacy directory
                 static QString xswiftbusLegacyDir(const QString &rootDir);