I think the following answer is the correct one. Where is Ali going? To Mehrabad Airport.
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BarbaraPAYou could also say "He is going to..."Thank you Barbara. When someone asks .... Where is Ali going?
BarbaraPANo.Where is Ali going?He is going to Mehrabab airport.To Mehrabab airportMehrabab airportOk, Barbara. Then as if there is a difference between "What" and "Where" on this. Because on "what" we can say .....