Originally Posted by
Chiller3333
I've gotten these for various UA cash bookings in the past.
Most of the time the email is a few hours late such that it doesn't really help :P
For travel under non-390 ticket numbers, I had previously never seen them for flights on mileage tickets with no A3 flights on the bookings
The emails indeed didn’t seem to be the most timely, although the ones I got did come in before the boarding cut-offs for the delayed trip.