If you click on "Details Anzeigen" you can see the specific flights, but there seem to be some issues with the Kayak display engine. For example, a 7:20 am flight from IAH to ORD is listed as "Air Canada – Flug 638" when it is clearly a UA flight (UA 638).
However, if you click on "Wählen" (Choose), it will take you to the Flugladen.de website. Then click on "Flugdetails" and you can see the full breakdown of which flight is on what metal. For the handful I saw, every flight except for NRT-CGK (and back) is on UA metal.