Just this past weekend I had two instances of delayed flights and messed up reservations.

First was Saturday, RDU-ATL-DEN. We were all on board but still at the gate when ATL issued a ground stop. Once it got to the point where I knew I'd miss my connection, I called the PM line and had them switch me to a later flight to DEN. BTW - Definitely no "protection" available, they had to fully switch me to the new flight. I then logged in a few minutes later to the DL app on my phone to see where I was on the ATL-DEN upgrade list for the new flight. My online itin did not show me confirmed on the new ATL-DEN flight, so I clicked the "confirm changes" button in the app.

So how either due to the phone agent, or due to my clicking the confirm button, my reservation for the RDU-ATL leg (which I was sitting on the plane) got cancelled. I wouldn't have know except the GA came on board and asked to see my boarding pass, and informed me that I was no longer listed on the flight. They got it fixed with minimal hassle, and as a bonus I got rebooked in paid F (I was sitting in F on an UG) so I got the %50 bonus. ^

Then again on Monday I was flying DEN-MSP-RDU when we had a mechanical in DEN that caused me to miss my connection in MSP. I checked the DL app mid flight DEN-MSP to see what I had been rebooked on, and saw now I was going MSP-STL-RDU. No big deal except I had a very short connection and when I got the gate for MSP-STL they couldn't issue me a boarding pass because my reservation was totally hosed. I was told to get on board and they would fix it by the time I got to STL. The GA at STL had the same problem and couldn't issue a boarding pass either. Luckily I was still able to get on and finally get to RDU only 2 hours later than I should have.

I have never had so many issues with the DL irregular ops rebooking process as I did this weekend. My itins on the DL.dumb web site had so much red all over them and crossed out times, that I could barely figure out what plane I was supposed to be on.