Add a version of flights that's made of components.

sky/tests/framework/flights-app.sky

Index: sky/tests/framework/flights-app.sky
diff --git a/sky/tests/framework/flights-app.sky b/sky/tests/framework/flights-app.sky
new file mode 100644
index 0000000000000000000000000000000000000000..e42ff36e275ee78bdd0f8258969f5dafdb00ba9e
--- /dev/null
+++ b/sky/tests/framework/flights-app.sky
@@ -0,0 +1,10 @@
+<sky>
+  <import src="/sky/examples/flights-app/flights-app.sky" />
+  <script>
+  addEventListener("load", function() {
+    var app = document.createElement("flights-app");
+    document.querySelector("sky").appendChild(app);
+    internals.notifyTestComplete(internals.renderTreeAsText());
+  });
+  </script>
+</sky>