This is why I no longer fly Delta!!! Every single time I booked with them, my flights were changed. I completely understand equipment changes and route changes...especially when you book 10 months out. But to make more than two changes? And then to split up a party that originally booked together and that is on the same itinerary!!! One time, I booked my dd and I on a flight at 3:00 pm. I wasn't crazy about it, but it was the least expensive non-stop. Imagine my surprise when, about a month before departure, I see a change in my itinerary. They have cancelled our flight and...put me on a flight at 10am, and dd on a flight, with connections, at 1pm!!! Seriously? She was 9 y/o!
Called them immediately. I was told that the computer makes all the changes! They actually put both of us on the flight I had originally wanted, but it was too expensive...at 8am! But man, what a hassle and headache. No more Delta for me.
I posted on here a couple years ago about our experience with American Airlines in Feb 2011. Months before, I had booked airline tickets for me, my husband, and our three y/o grandson, making sure we were sitting together. About a month out, I got an email saying our flights had changed. When I went online to check, they showed me and my husband had been moved to an earlier flight coming home, but they'd left our 3 y/o grandson on the first flight, that was leaving MCO an hour
after ours. I called to get it straightened out and for some reason the rep had a hard time understanding why I was upset. She just kept saying that our flight had been way overbooked and they had to move some of us to an earlier flight and that we could just wait in Dallas for our grandson's flight to land an hour after ours.

I finally said, "Yeah, like I'm going to walk off and leave a 3 y/o in the Orlando airport alone. I'll just hand him his boarding pass and tell him to get on the next plane." At that point, she laughed and said, "oh yeah, you did say he was three. Sorry, I was thinking thirty. No I guess that won't work.".

When I booked the tickets originally, I had checked the box saying two adults and one child. Anyway, she put me on hold, then came back to tell me she had moved someone off our new flight so she could put our grandson on the flight with us and that she'd also gotten us seats together again. I kept an eye on those flights up until the night we flew to Orlando, but was not taking a computer with us, so couldn't keep an eye on the return flight while we were down there. The morning we checked out of POFQ, I got the boarding passes from the DME desk, but didn't bother looking at them, until we were on the DME bus on the way to the airport. Sure enough, someone had went in and changed our seats and we were sitting all over the plane. This was the first time our 3 y/o grandson had ever flown (beside the trip down there a week earlier). No way was he going to be willing to sit alone, next to strangers. We went straight to the AA check in desk, where we were told that apparently they'd had an equipment change again and our seats had gotten scrambled again. They said the flight was full and there was nothing they could do, but to ask the gate agent to handle it. When we got to the gate, the agent told us to ask the FA on the plane to have someone move and it wouldn't be a problem, as no one would want to sit by a upset 3 y/o. However, it didn't come to that. A little while later that same GA called us up to the desk and said she had gotten us seats in the first economy row (just past first class) and we were all sitting together. Apparently they were holding some seats back.