In order for only TED aircraft to park at gates 42, 44, 46, 48 and 50, please do the following. 

Open the aircraft.cfg for your TED AI aircraft (I use the FS Painter A320 repaint).

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Amend the following text as follows....

**EXAMPLE TXT**

atc_parking_types=GATE
atc_parking_codes=UAL <<< CHANGE THIS 



atc_parking_types=GATE
atc_parking_codes=UAL2 <<< TO THIS

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Then do the following.....

Open your "ParkingSpecs.txt" file (should be located in the same folder as your AFCAD program)

Add the following text...

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United Airlines (Ted),200,0,110,UAL2  <<<<< Add This Line under the "United Airlines,200,0,110,UAL" section

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Now save and close the file. 

Your TED aircraft will now use the above gates. No other aircraft will use them. See the screenshots.

Thanks

Lee