Not with United. I had two flights in a row that I was all checked in with boarding passes on my phone, and then they bumped me due to an "equipment" change the

Not with United. I had two flights in a row that I was all checked in with boarding passes on my phone, and then they bumped me due to an "equipment" change the night before my flight. In one case I was able to get a new seat immediately and re-checkin, in the other I had to show up at the airport four hours before my flight and beg for one of the few unassigned seats. Then I got to watch hysteria at the gate from all the people that got bumped... I've never had any other airline try to bump me at all, let alone after checking in. (Just to add, I think the "changing" equipment claim is a common excuse they make up. It allows them to overbook and bump people without having to pay the US mandated fees to each person who gets bumped. In at least one of these cases they replaced the original plane with a plane of the same exact type, but claimed "it might have a different seat layout so it counts as an equipment change".)