Just a small tip if doing this (at any location) - taxiways and aprons and scenery that sit on them will be at the revised altitude but the runways themselves will not. Not even if you also change the runway altitude and the start locations altitude (which you should do anyway). It seems that in FS9 all of the items are self-flattening except runways (ie do not need a flatten file) but there is a way to bodge this. If you create a rectangle of apron under the entire runway, whether in grass, concrete or whatever, it should do the trick.DanKH wrote: If you change the airport altitude all the parts of the airport should follow....
Changing an airports altitude will also create sunken or floating AI traffic, but that is not difficult to fix but I'll stop waffling for now.
John















