diff --git a/lib/arrow/shuttles/shuttle.ex b/lib/arrow/shuttles/shuttle.ex
index 0e510277..31412bd1 100644
--- a/lib/arrow/shuttles/shuttle.ex
+++ b/lib/arrow/shuttles/shuttle.ex
@@ -8,7 +8,9 @@ defmodule Arrow.Shuttles.Shuttle do
     field :shuttle_name, :string
     field :disrupted_route_id, :string
 
-    has_many :routes, Arrow.Shuttles.Route, preload_order: [asc: :direction_id]
+    has_many :routes, Arrow.Shuttles.Route,
+      preload_order: [asc: :direction_id],
+      on_replace: :delete
 
     timestamps(type: :utc_datetime)
   end