diff --git a/aman/sys/aco/RunwayManager.py b/aman/sys/aco/RunwayManager.py
index dd280c9..7d4cf03 100644
--- a/aman/sys/aco/RunwayManager.py
+++ b/aman/sys/aco/RunwayManager.py
@@ -51,7 +51,7 @@ class RunwayManager:
         if None == constrainedETA:
             eta = max(arrivalTime, earliestArrivalTime)
         else:
-            eta = max(constrainedETA, earliestArrivalTime)
+            eta = max(arrivalTime, max(constrainedETA, earliestArrivalTime))
 
         return eta, eta - arrivalTime