I personally use Notepad++ to edit *.xml files and MS Excel for *.csv files.
@OldHat - how do you want to implement (place) static planes on airfield? Do you want to modify airfield xml files? Then there may be a conflict with my mod, because it will overwrite static (parked) planes by plane types currently located at the airfield, so it could probably overwrite also your plane. We have to discuss implementation in more detail, perhaps over PM?