diff --git a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/MovingConfig.java b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/MovingConfig.java
index 7740bf09..2ad9e015 100644
--- a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/MovingConfig.java
+++ b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/MovingConfig.java
@@ -259,16 +259,17 @@ public class MovingConfig extends ACheckConfig {
 
         creativeFlyCheck = config.getBoolean(ConfPaths.MOVING_CREATIVEFLY_CHECK);
         final ModelFlying defaultModel = new ModelFlying("gamemode.creative", config, 
-                ConfPaths.MOVING_CREATIVEFLY_MODEL + "creative.", new ModelFlying());
+                ConfPaths.MOVING_CREATIVEFLY_MODEL + "creative.", new ModelFlying().lock());
         for (final GameMode gameMode : GameMode.values()) {
             flyingModelGameMode.put(gameMode, new ModelFlying("gamemode." + gameMode.name().toLowerCase(), config, 
-                    ConfPaths.MOVING_CREATIVEFLY_MODEL + (gameMode.name().toLowerCase()) + ".", defaultModel));
+                    ConfPaths.MOVING_CREATIVEFLY_MODEL + (gameMode.name().toLowerCase()) + ".", defaultModel).lock());
         }
         flyingModelLevitation = new ModelFlying(ID_POTION_LEVITATION, config, 
                 ConfPaths.MOVING_CREATIVEFLY_MODEL + "levitation.", 
-                new ModelFlying(null, defaultModel).scaleLevitationEffect(true));
+                new ModelFlying(null, defaultModel).scaleLevitationEffect(true).lock());
         flyingModelElytra = new ModelFlying(ID_JETPACK_ELYTRA, config, 
-                ConfPaths.MOVING_CREATIVEFLY_MODEL + "elytra.", defaultModel);
+                ConfPaths.MOVING_CREATIVEFLY_MODEL + "elytra.", 
+                new ModelFlying(null, defaultModel).verticalAscendGliding(true).lock());
         creativeFlyActions = config.getOptimizedActionList(ConfPaths.MOVING_CREATIVEFLY_ACTIONS, 
                 Permissions.MOVING_CREATIVEFLY);
 
diff --git a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/model/ModelFlying.java b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/model/ModelFlying.java
index fad2dec8..b2539829 100644
--- a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/model/ModelFlying.java
+++ b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/model/ModelFlying.java
@@ -44,6 +44,11 @@ public class ModelFlying {
     private double horizontalModSprint = 1.92;
     /** Modifier for vertical flying speed in per cent, for ascending. */
     private double verticalAscendModSpeed = 100.0;
+    /**
+     * Apply special mechanics for allowing some vertical ascension with
+     * gliding.
+     */
+    private boolean verticalAscendGliding = false;
     /** Maximum flying height above the maximum building height of the map. */
     private double maxHeight = 128;
     /** Apply modifiers like sprint, flyspeed, walkspeed, potions. */
@@ -93,6 +98,7 @@ public class ModelFlying {
         horizontalModSpeed(config.getDouble(prefix + ConfPaths.SUB_HORIZONTAL_SPEED, defaults.getHorizontalModSpeed()));
         horizontalModSprint(config.getDouble(prefix + ConfPaths.SUB_HORIZONTAL_MODSPRINT, defaults.getHorizontalModSprint()));
         verticalAscendModSpeed(config.getDouble(prefix + ConfPaths.SUB_VERTICAL_ASCEND_SPEED, defaults.getVerticalAscendModSpeed()));
+        // TODO: verticalAscendGliding.
         maxHeight(config.getDouble(prefix + ConfPaths.SUB_VERTICAL_MAXHEIGHT, defaults.getMaxHeight()));
         applyModifiers(config.getBoolean(prefix + ConfPaths.SUB_MODIFIERS, defaults.getApplyModifiers()));
         gravity(config.getBoolean(prefix + ConfPaths.SUB_VERTICAL_GRAVITY, defaults.getGravity()));
@@ -112,6 +118,7 @@ public class ModelFlying {
         horizontalModSpeed(defaults.getHorizontalModSpeed());
         horizontalModSprint(defaults.getHorizontalModSprint());
         verticalAscendModSpeed(defaults.getVerticalAscendModSpeed());
+        verticalAscendGliding(defaults.getVerticalAscendGliding());
         maxHeight(defaults.getMaxHeight());
         applyModifiers(defaults.getApplyModifiers());
         gravity(defaults.getGravity());
@@ -161,6 +168,10 @@ public class ModelFlying {
         return verticalAscendModSpeed;
     }
 
+    public boolean getVerticalAscendGliding() {
+        return verticalAscendGliding;
+    }
+
     public double getMaxHeight() {
         return maxHeight;
     }
@@ -188,8 +199,8 @@ public class ModelFlying {
     }
 
     public ModelFlying horizontalModSprint(double horizontalModSprint) {
-        this.horizontalModSprint = horizontalModSprint;
         checkLocked();
+        this.horizontalModSprint = horizontalModSprint;
         return this;
     }
 
@@ -199,6 +210,12 @@ public class ModelFlying {
         return this;
     }
 
+    public ModelFlying verticalAscendGliding(boolean verticalAscendGliding) {
+        checkLocked();
+        this.verticalAscendGliding = verticalAscendGliding;
+        return this;
+    }
+
     public ModelFlying maxHeight(double maxHeight) {
         checkLocked();
         this.maxHeight = maxHeight;
diff --git a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/player/CreativeFly.java b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/player/CreativeFly.java
index 3a37a541..c133a516 100644
--- a/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/player/CreativeFly.java
+++ b/NCPCore/src/main/java/fr/neatmonster/nocheatplus/checks/moving/player/CreativeFly.java
@@ -375,7 +375,7 @@ public class CreativeFly extends Check {
         }
 
         // Related to elytra.
-        if (limitV == 0.0 && Bridge1_9.isGlidingWithElytra(from.getPlayer())) {
+        if (limitV == 0.0 && model.getVerticalAscendGliding()) {
             // TODO: Better detection of an elytra model (extra flags?).
             limitV = hackLytra(yDistance, limitV, thisMove, lastMove, data);
         }