Any XML format is potentially useful for data ingestion for aeronautical purposes. The key here is the questions:
Is the vertical datum supplied useful for extracting height information or elevation information that I need? (if not can I convert it safely to what I need).
Are there features in the landxml that is useful for me?
Is the horizontal datum suitable for transformation to match up with my other aeronautical datasets for facilities, obstacles and or terrain?
I would need to look further into the specifics to see what might usefully be transformed.