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This airport wasn't built for the huge increase in domestic airlines and flights India has experienced in the last decade or so (there are about 15 domestic airlines or so right now).
It is particularly during the foggy season (Dec-Jan) when morning flights all get delayed for hours and you are packed in like sardines in the terminal. It would be easy to miss a flight here as they also like to keep departure times a secret until the last minute. Samosas and tea are about the only food you will find--there is a "Cafe Coffee Day" coffee shop--in the arrivals section however. And of course there is the usual Indian collection of touts with taxis, which you might have to endure if the lineup for a prepaid taxi looks like it will be an hour or so. Then there is the toilet without a toilet paper dispenser (for western style) or a tap (for Indian style), the (one) airport restaurant with horrible food and indifferent staff, and many other examples of "what were they thinking?" design common to India.