diff --git a/lib/TrackingStatus.lib.php b/lib/TrackingStatus.lib.php
index 2208ff2..203ad15 100644
--- a/lib/TrackingStatus.lib.php
+++ b/lib/TrackingStatus.lib.php
@@ -176,6 +176,7 @@ class TrackingStatus {
             case "WX":
             case "AP":
             case "CI": // stuck in customs
+            case "AT": // departed a transfer airport (int'l)
                 return TrackingStatus::TRACKING_STATUS_TRANSIT;
             case "01":
             case "13":