I have to give credit when due: they keep making improvements to mobile.delta.dumb, including the ability to search for reservations by:
- SM #
- Conf #
- Ticket #
- Credit card #.
It's still dumb, because once logged in, I can see the general itinerary, but can't drill down into the itins to see specific flights/seats/etc. just the first flight.
Keep trying DL!