The airport I'm working on is E25, Wickenburg Muni. It's just northwest of Phoenix. I've excluded the default buildings I don't want and put in new generic T-hangars to match up with the photo scenery. The T-hangars are floating above the ground. I haven't done anything with flattens to revise the elevations. I tried deactivating the scenery, and the default airport has the same problem...grrrrr. I tried setting alt="-1.0M", but the xml wouldn't compile. I also tried setting altitudeIsAgl="FALSE" with a new elevation, but again it wouldn't compile. The xml code I used as a template was from the original airport. I adjusted the location, length and width of the buildings. They compile correctly as long as I don't try to fix the elevation. It's not really noticeable until you taxi by one of the hangars and notice the shadow doesn't look right and you can see background objects under them. Is there some way to get the hangars planted on the ground where they belong?