Based on my experience at DEL last month I would be very careful about having the right documentation to enter the airport. Admittedly we were going international but we got held up at the door to the terminal by several tough looking soldiers with machine guns because we didn't have all the paperwork they thought we needed. Finally straightened out, but it was no fun.

Problem was you need a printed itinerary with your name on it according to the Captain in charge and we hadn't printed one out. We, of course, had our passports.

Eventually, using a computer and printer the soldiers had right inside the gate they printed out a passenger manifest and our names were located on it. Really pretty efficient, but I would have rather had everything in order before getting to DEL. Those guys with guns make me nervous!

PS also found out that in India you can't get into the terminal more than four hours before flight time, in our case 3 AM. So much for our plan to hang out in the biz lounge for several hours before the flight after an all day trip to the Taj.