Michael,
What I do with mine is start from the west and work my way to the east, with ORBX products starting at the farthest western point and directly above Ultimate Terrain. Then as I go west from there I layer in my products. So I start with California with any photo real stuff like MegaScenery/MegaScenery Earth being the first followed by KSFO, KLAX when its out, then Las Vegas MegaScenery, then FSDT KLAS, etc. I always make sure to put the photo real stuff first then the airports on top of it that fall with in that region. I do the same thing until I get to European sceneries which always remain at the top of my scenery layers.
Do it in this order has served me well thru the years and of course since it goes from west to east, it makes it easier to find an entry in the library should I need to remove, enable, or disable it.
That sounds like a logical and unforgettable way to install airports and scenery. The last reinstall that I did all the airports and scenery were reinstall in a haphazard manner depending where I wanted to fly first. I then ordered them in the FSX Scenery Library in accordance with what I wrote in the first post. I had a question regarding the screenshot below. I am attempting to get rid of those repeatable rows of whatever. This shot was in Canada just north of Montana. I am thinking that maybe GEX-NA or UTX-NA would eliminate these rows. I am not concerned about terrain seen from lower altitudes. I am satisfied with FSX default except where I have installed MegaScenery X or MegaScenery Earth but these shots from cruise altitude are horrible. Do you have any idea about which one may do the trick and work with Windows7 64 bit. To assist you I am posting the rest of my signature from a avsim forum. The 300 charater limit wipped out all of the adddons
Seagate 500GB External HD
WD 250GB External HD, FSX Gold
CS 757-200, 757-200F, 767-200, 767-300,PMDG 747-400X, 747-8X. MD-11
ASX, X Graphics, REX2+OD, FSUIPC4 registered TOPCAT
FS Dreamteam KJFK, KORD, KDFW, KFLL, TSS Sound for 767-300 GE and PW, IRIS 757-200 RR Sound
vroute premium, MegaSceneryEarth, MegaSceneryX-So Cal, PHX, nDAC3, FlyTampa-KBOS KTPA, Aerosoft-EHAM, EDDF
imagine KATL, VHHH, ORBX PNW