When you travel from US (international flight) each person is allowed to carry two suitcases each weighing not more than 32 Kg (in Us they use pound not kilogram so in pound it is approx 70). So, if you pack your luggage according to that you will face problem in delhi airport. Now a days it is not that troublsome to travel via Delhi like in past. e tickets are the tickets which comes to you via email if you book the tickets in internet. Now a days even travel agents issue e ticket ( because it is cheaper to print e ticket than conventional ticket) it is just a page that contain all the information about your travel. Most of the flight from Delhi to KTM dont use e ticket just because they dont use internationally agreed software by IATA. so they issue conventional ticket instead. For Nepalis its cheaper to tarvel via Delhi, and these days also via UAE