Just a FYI...
I just flew out of Delhi.. and it is a nightmare... the construction is causing such chaos.. so if you are flying out, be prepared to stand in like for 3 hrs for immigration(2 hrs) and security(1 hr). I hear it will be like this for another month at least, so get to the airport at least 3 hrs early. The planes were waiting for passengers but the bad part is if you have a connection, you will most likely miss it.