Nothing fishy - The fog did hit DEL that day as you can see from the report below.
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http://www.newkerala.com/news2.php?a...lnews&id=13591
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Most likely AGR and JAI would have been affected as well. And even if JAI was not, the airport I don't think has acres and acres of real estate like LGW (read parking stands) - plus there has to be some one available at short notice to receive the guests (read- customs and immigration). JAI is an international airport, but not too many flights land there. Most of the other nearby airports are Domestic airports.On that score, Ahmedabad would have been the nearest suitable terra firma!!!