diff --git a/src/main/lemondronor/advisorycircular.cljs b/src/main/lemondronor/advisorycircular.cljs
index e0513e7..6d31d82 100644
--- a/src/main/lemondronor/advisorycircular.cljs
+++ b/src/main/lemondronor/advisorycircular.cljs
@@ -86,7 +86,7 @@
     {:postime (numstr (e "postime"))
      :lat (numstr (e "lat"))
      :lon (numstr (e "lon"))
-     :icao (e "icao")
+     :icao (.toUpperCase (e "icao"))
      :registration (nilstr (e "reg"))
      ;; Altitude in feet at standard pressure.
      :alt (numstr (e "alt"))