Doug,
Ultimate terrain does not add airfields.
It adds the following::::
Extensive Road Network: Adds every available road from Navteq's commercial navigation data. Each road is accurately placed to match its real world location.
This shot is taken in Hawaii. (Ultimate Terrain USA & Canada offer the same stuff), Notice the roads, the accurate coastlines, the landclass that shows a golf course, a city and different textures on the mountains.
Railroads: Includes a data set that gives users enhanced railroad coverage in major cities, including rail yards.
Spectacular Night Lighting: Adds a new night lighting environment unlike anything else on the market. This feature will add actual points of light, to simulate street lights, automobiles, and rural farms. Previously, this functionality has only been seen in many professional flight simulators.
Accurate Water Data: This product also includes corrected Oceanic coastlines, plus islands, lakes and rivers, based on commercial data.
Landclass Enhancments: Adds enhanced landclass textures and placement in metropolitan areas, fields, plains, valley's, etc...
Also included in the product are detailed land polygons for things like parks, golf courses and cemeteries. The polygons will align with the road boundaries, just like you would see them on high quality mapping services and GPS units.
Doug, once the Ultimate terrain software is loaded, there is an interface that you can turn things off and on.
Are you familiar with this?
As you can see, I have Ultimate terrain, both USA & Canada and can't imagine my sim without it!
Dave