हम उस देश के वासी हैं, जिस देश में Shiv Ganga दौड़ती है

Usually at International airports, there would be a PRS counter.
And Chennai airport too has one such.
The only problem can be whether people can buy tickets by coming inside the airport. I mean, who are boarding and deboarding the plane will have access to the PRS counter. Rest, might not have.

Yesterday,I had checked @ Madras airport. There is a PRS counter in the kamaraj domestic terminal. It adjacent to the CANTEEN there. Its accessible by both ordinary people and airport passengers too. The rush is not there for the passengers counter but a lot for ordinary counter.
Thanks.