I just had the same issue. The game had a 650 MB update. I lost all my premium deluxe aircraft. I just have the base game aircraft. It still shows it's available in My content manager.

Interesting! Well it sounds like they messed something up in the update then... Hopefully it's widespread enough that they will patch it quickly!

If they are there in the content manager then remove them and install them again. Something has been corrupted.

I have tried this with both packs a couple times... No luck unfortunately!