Share on Google + Share on Facebook Share on LinkedIn Share on Twitter Email this article Enlarge Photo A new Southwest Airlines TV commercial breaking Sunday takes viewers to four very different wedding receptions. Lewis Lazare Reporter- Chicago Business Journal Email | Twitter Did you ever think Southwest Airlines (NYSE: LUV) would totally abandon its wildly unconventional way of doing advertisin For four decades Southwest was synonymous with outlandish TV spots. The airline only got a little more buttoned down, so to speak, when 18 months or so ago it turned to TBWA/Chiat/Day in Los Angeles to do a brand campaign intended to suggest Southwest had grown up after more than 40 years in the skies. But not so fast. Grown up it may be, but starting Sunday, during National Football League game telecasts, Southwest is going to get a little (well a lot really) youthfully corny aga...