I'll follow up to my own post. Yes, Southwest has made acquisitions in the past. That's why I would model my new airline (TinoAir has a nice ring) just like LUV.
Plus, because all of the employees would have stock options, they would offset any potential loss of seniority through a one-time payment from their option profits.
Unlike LUV, though, there would be a return of the hotpants and free drinks.