The Transportation group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Is Air Transport Services (ATSG) one of those stocks right now? 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.Air Transport Services is one of 135 companies in the Transportation group. The Transportation group currently sits at #8 within the Zacks Sector Rank. The Za ...