diff --git a/kustomize/overlays/prod/deployment_patch.yaml b/kustomize/overlays/prod/deployment_patch.yaml
index bbe441f..5adbbe6 100644
--- a/kustomize/overlays/prod/deployment_patch.yaml
+++ b/kustomize/overlays/prod/deployment_patch.yaml
@@ -17,11 +17,6 @@ spec:
       - name: healthcheck
         imagePullPolicy: IfNotPresent
         env:
-        - name: AIRCRAFT_TRACKING_MAX_DELAY
-          valueFrom:
-            secretKeyRef:
-              name: healthcheck-env-prod
-              key: AIRCRAFT_TRACKING_MAX_DELAY
         - name: BFRS_URL
           valueFrom:
             secretKeyRef:
diff --git a/kustomize/overlays/uat/deployment_patch.yaml b/kustomize/overlays/uat/deployment_patch.yaml
index f2bc2b7..b8ad670 100644
--- a/kustomize/overlays/uat/deployment_patch.yaml
+++ b/kustomize/overlays/uat/deployment_patch.yaml
@@ -17,11 +17,6 @@ spec:
       - name: healthcheck
         imagePullPolicy: Always
         env:
-        - name: AIRCRAFT_TRACKING_MAX_DELAY
-          valueFrom:
-            secretKeyRef:
-              name: healthcheck-env-uat
-              key: AIRCRAFT_TRACKING_MAX_DELAY
         - name: BFRS_URL
           valueFrom:
             secretKeyRef: