Some airports cannot be entered in airac cycle 2509 rev.2 (e.g., zuuu, zppp)

[NAVData]

Hi,
Please try this:

FAQ - MSFS2024 (SU3 and above) - airport, procedure, waypoint, 3rd party & flightplan import issues

There is a new loading order logic since SU3; therefore, it is essential to reset your content.xml file when, for example: You miss airports. You miss procedures. You miss waypoints. Legs are missing from the nav devices. There are third-party scenery issues. There are flight plan import issues. … This file will be automatically recreated at the next simulation start. You will find the content.xml file in the following locations (Note, the location has changed since SU3 - it´s now in a sub-f…

It is hard to say what the reason is due to the lack of information from your side, but as you see, when all is set correctly, all packages are fully SU3 compatible—both airports are selectable without any issue.

Cheers,
Richard