A new Southwest 737-700 looking good in colorful livery and in-production blended-winglets at Boeing Field this week. Southwest Airlines took delivery of its 175th new Boeing [NYSE:BA] 737-700 Thursday. Four Southwest employees and their guests, winners of a Southwest-sponsored trip to Seattle, also participated in the ceremony. This year Southwest celebrates 10 years of service to Seattle and was again a major sponsor of Seafair.