Listing for the jumpseat in Delhi is not that hard except that you've to keep explaining again and again that you need to list for the flight which most of the gate agents don't understand. There are only handful of people that actually work for United that can list you. I'll give you there names as it'll make this process easier. I only know 2 names, they're Mohit & Ashish. To list for the jumpseat you're going to have to go airline ticket counter at either Lounge A or B. There you're going to request to list for the jumpseat. You've to give your badge & passport to list. You cannot enter the airport until they list you & give you a copy of that listing.

Flights from India to US are almost everyday oversold during this time with school breaks going on. In India, you cannot go to the gate with a STANDBY boarding pass as you've to go through immigration. So, I would highly suggest that you let the captain know of your presence and that you're trying to jumpseat on his/her flight. I got the email address of UAL jumpseat coordinator. Since I had issues with jumpseating out of DEL before, I now email him when I plan on jumpseating so he could let the captain know that I'll be there.

Always have a back up plan. Last time the gate agents would not accommodate myself & 4 other non-revs stating weight issue. Captain of that flight later emailed me saying he would've been able to take us all but Chicago wouldn't give clearance to DEL station to release seats to non-rev. The immigration situation makes it hard since you're not at the gate & it can take 30-60 minutes just going through immigration/security so sometimes if it's close to departure, station will close the flight so as to not delay the flight.