I have a training session in Kolkata, India. The flight from Narita to Delhi will be on AI307, arriving in Delhi at 18:00. The flight between Delhi and Kolkata is AI 401, which leaves at 07:10 the next morning. Since I am a student and I don't have money, I would like to spend the night at the Delhi airport, is that not a problem?
If possible, it is better to stay at an airport hotel. If you must stay up all night at the airport, do not stay in the international arrival hall, but go to the domestic departure hall and sit in the back of a coffee shop or restaurant. The biggest risk is that you may be the victim of theft from a pickpocket.
We never heard from him after that, so we assume that he was able to travel to Kolkata without any problems.
From a criminal's point of view, the international arrivals hall of the airport is like turkey voting for Christmas coming out of the arrival gate. We advised him to move to the departure area as soon as possible, as there is less chance of theft in the departure area than in the arrival area. It is also easy to become a victim of crime if you leave your bag or other items hanging over the back of a seat or a seat near the doorway of a coffee shop. You can reduce the risk of a theft by securing a seat as close to the back wall as possible and keeping your luggage between you and the wall.