I just flew on a 984 ticket booked through a third party website that booked into MCS. Everything's gone OK so far... I'm expecting the battle royale to be getting credit at 150% since VX-related content is being scrubbed.
For instance,
https://www.alaskaair.com/content/mi...virgin-america now redirects to
https://www.alaskaair.com/content/mi...earn-on-alaska... which is, um, not helpful since this was a 984 ticket flown on VX, not AS.
Fortunately...
https://web.archive.org/web/20170907...virgin-america
Now I'm worried I'm going to have to tell them "No, it wasn't an upgrade, I bought the ticket in MCS".