Both Mesaba and Colgan already have their class date as DOH. They are arguing against Pinnacle getting class date as DOH. Instead, both want Pinnacle to use the sim date, and are trying to use ALPA's merger policy's two main definitions of date of hire to try and prove their case. So they are together against Pinnacle to try and screw them out of 2-3 months seniority on average.
No, ALWAYS is the key word. That picketing mess 9E was on it's own too. I can't recall a single thing Colgan has gone against Mesaba on.