For those looking to find strong Transportation stocks, it is prudent to search for companies in the group that are outperforming their peers. Has Southwest Airlines (LUV) been one of those stocks this year? A quick glance at the company's year-to-date performance in comparison to the rest of the Transportation sector should help us answer this question.Southwest Airlines is a member of the Transportation sector. This group includes 135 individual stocks and currently holds a Zacks Sector Rank of #10. The Z ...