this article makes a good case of casting doubt on Alaska, Hawaiian or JetBlue merging with anyone.
http://www.fool.com/investing/general/2013/12/27/dont-buy-alaska-air-for-a-delta-buyout.aspx
http://www.fool.com/investing/general/2013/12/27/dont-buy-alaska-air-for-a-delta-buyout.aspx