CX doesn't have a lounge at DEL... if you are in business class for your flight to KTM, then you might be able to use one of the 2 shared lounges at DEL... sounds like you never been to DEL before... if at all possible, I wouldn't want to stay in that airport for longer than an hour or 2! dunno what to suggest, but I think other Indian experts on this board will be better equipped to answer you regarding transit options in DEL....