Here’s how to enable the feature. Only do this if your comfortable with editing config files, you can never be too safe, so if your are going to, BACK UP YOUR FILES!
Locate the user version of the file named Standard.xml. Here are the default locations on Windows XP and Windows Vista:
Windows XP:
C:\Documents and Settings\
If you don’t see the Application Data folder, you need to turn on Show Hidden Files and Folders: tools>optins>'view' tab> then uncheck 'hide hidden files'
Windows Vista:
C:\Users\
If you don’t see the AppData folder, you need to turn on Show Hidden Files and Folders (see below).
Make a backup copy of this file and put it in a safe place in case you ever want to revert to the original file.
Open Standard.xml with Notepad or another text editor.
Add an Entry block in the Keyboard_Main area of the simcontrols.map section (at the beginning of the file), by inserting the following text as shown (note that CTRL+SHIFT+P is the suggested key combination, but you can assign it to anything you like - just verify that it isn't already in use):
Save the file.
Start Flight Simulator X, fly, and press Ctrl+Shift+P (or whatever you assigned it to) to toggle airport name display on and off.
You'll come across loads of new airports Oh, and if you were so devil-may-care as to ignore step two, and then find that you want to undo your changes, just delete Standard.xml, and FSX will replace it with a clean copy the next time it starts.

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