Change of plane. The new one is an A330-NEO and has 8 less Delta One seats.

We bought this ticket in March with miles, so maybe she was bumped because of it. And honestly, I've been trying to use these miles since 2020 with no avail. And the tickets cost 500k miles, I'm not even kidding. We just wanted to get rid of them since we are never able to use them for one reason or another.

Phone people explained computers do these things when she asked why she wasn't moved to premium economy in the first place.

I know people keep saying Delta is the best airline in the US but most times I've tried to use them we had problems. United always finds a solution, so did American, and even British - regardless if we're using miles or not. Delta one time canceled on us and said they only could take us home 5 days later for a LAS-SEA return trip.