While technically correct because that's what the 8-K says, your own excerpt shows that Midwest Air Group merged with "RJET Acquisition, Inc.", not Republic Airways Holdings (an important distinction to make). While the surviving corporation from that merger with RJET Acquisition will be Midwest Air Group, MAG will be a wholly-owned subsidiary of Republic Airways Holdings.

So for all intents and purposes, RAH *did* acquire Midwest Air Group.