Something I just noticed.

It looks like the MQM bonus between fare classes has disappeared for all flights starting January 2024.

That is to say if you shop for a flight in 2024 you'll notice the MQM is identical regardless of whether you buy Main, Premium Select or Delta One / First Class.

That is not the case in 2023.

Is this a bug?

Edit: I just noticed there's some discussion about this earlier