diff --git a/assets/client.js b/assets/client.js
index b3add82..ef74e74 100644
--- a/assets/client.js
+++ b/assets/client.js
@@ -271,7 +271,7 @@ Aircraft.prototype.toHTML = function () {
   if (this.callsign) {
     // Use noreferrer because Flightradar24.com would otherwise respond with 418
     html += `
-      <a href="https://www.flightradar24.com/${this.callsign}" rel="noreferrer">Flightradar24.com</a>
+      <a href="https://www.flightradar24.com/${this.callsign}" class="external" target="_blank" rel="noreferrer">Flightradar24.com</a>
     `
   }
 
diff --git a/assets/style.css b/assets/style.css
index 695f3da..f509dee 100644
--- a/assets/style.css
+++ b/assets/style.css
@@ -31,3 +31,9 @@ html, body {
 table.list th {
   text-align: left;
 }
+
+/* Adds icon indicating an external link after the element */
+.external:after {
+  content: " " url(data:image/png;base64,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);
+  margin: 0px;
+}