Hello everyone, - my first post in this forum - 
Same problem here, pre-ordered a Deluxe Premium, and got an incomplete set.
I know that I’m not alone in this situation 
many customers complain about that, but the good thing is that Microsoft is aware of this.
I’ve also received the Xbox message for the “Deluxe” version, but this change/install nothing for my Premium. I also tried a full reinstall - no success, same issue, still missing aircraft.
The picture in my Xbox list, alsways show “standard” 
I’m affraid that the issue with the installer is even more than a simple miss…
I’ve tried to uninstall the “PREMIUM UPGRADE” package (1.67 Gio) to revert to a “Standard” version.
And there is something weird: only 24 aircraft instead of 25 
YES : if you look closely, you will notice that the Beechcraft B58 is missing !
Now take a look at the details of the installed elements: In the content manager, I’ve some duplicate aircraft 
Hey, what this mess ???
I have the B58 v 0.1.1 installed, but not shown in the hangar.
I have a duplicate Bonanza G36 (G36 v 0.1.27 and G36 - 01 v 0.1.1) installed !!! but only one shown in the hangar.
So there is defintely something wrong with the installer. Even with a standard version, I’m not sure that the update process will not let duplicate elements.
Xbox has no file manager, so manually removing unwanted files is impossible. If the installer is not strong enough, we can sure encounter soon a cahotic situation with this simulator.