Mesa has not announced a furlough. They have issued the "Warn Letter" and indicated that furloughs could become a possibility if the DAL contract dispute is not resolved in MAG's favor.

Mesa will hold a "Pilot Opportunity Meeting" on 1 Aug in Chicago.

Here is a link about it;

FLTops.com: Guiding Pilots to their Professional Goals

I guess that means that Mesa could be in both columns.