Re: リタイアリングルーム

国内線ターミナルのリタイアリングルームなら利用したことがありますが、国際線ターミナルは未確認です。

www.newdelhiairport.in/faq.aspには下記のような記載がありました。

Is there any retiring room/waiting room facility at International / Domestic airport?

Ans: International passengers holding valid tickets can enter the terminal building only 3 hours prior to the scheduled departure time. However they can avail the lounge facility available across the departure drop off area at the International Departure level. This can be used by bonafide ticket folders free of cost up to 8 hours prior to their scheduled departure. Visitors can use this facility by paying Rs. 60 per person. Visitors can also access the lounge at the Arrival level by paying Rs. 60 per person.

At the domestic Terminal 1B, DIAL has built a waiting area attached to the Terminal building for the convenience of passengers & visitors. No charge is applicable for the use of this facility.

At Domestic Terminal 1A, Terminal 1C, visitors can enter the terminal by paying Rs. 30 per person.

でも、http://www.airportsindia.org.in/igi/passenger_facilities.jsp#1には国際線ターミナル（の駐車場）にドミトリーがあると書いてあるみたいですね。

はっきりした情報ではなくてすみません。