If an airport has its own textures for taxiways, then real environment pro should not interfere with it.

If you want a really good Freeware airport, Try George Grimshaws Boston Logan:
Found here and the update found here

To add even more realism to it, download AES from Aerosoft here.

Together they are a fantastic package, KBOS is a very highly detailed airport already, and is actually made by a payware company. AES adds animated jetways, pushback trucks, and follow me cars to make the whole situation more realistic