OK, so here it is, hot off the NMB website (I had to type it freehand since I couldn't select it to copy for some reason):

CONCLUSION

The Board finds that Chatauqua, Shuttle, RA, Frontier and Lynx are operating as as a single transportation system (Republic Airlines et al/Frontier) for the craft or class of Pilots for representation purposes under the RLA. As detailed below, the former Midwest Pilots are included in the single transportation system...

The entire finding is posted on the NMB website (NMB.gov - What's New - Determinations - Fiscal Year 2011 - Page Cite 138).

Now let's see what ALPA does.