using ade editor can assign the ai aircrafts in their respective gates?
In ADE you can edit an airport and assign parking codes to individual parking spots. Instructions are in the ADE help document.
Example: You could assign the code AAL (for American Airlines) to several gates.
You then have to edit the aircraft.cfg files (in notepad) for your American Airlines ai aircraft as I outlined above. Give them the atc_parking_codes=AAL.
ATC should then send your AAL ai to AAL gates.
At that time  the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.