Just got a change on ORD-CVG in March. Simply an aircraft change - from 737-800 to 737-700, which ain't great...but is.

Interestingly, was alerted via text message which arrived overnight, noting they had to 'change the aircraft type or seating configuration' which required a change to seats. Never gotten a text for this. And no flag in the itinerary on my account. We got moved around a bit...from 24ACDF to 24F, 25D, and two in 26. Moved us all to row 12 instead. Don't understand how these changes really get made...you'd think if 24 were like for like seats, which they pretty much are in this case, they'd just try to do that to the extent possible. Not so much.

Not thrilled about the change, given the fewer F and E+ sears, but given every time I've been to CVG on mainline in the last, decade or so, it's always gone about half empty, I see why they might do it.