Buckingham analyst Daniel McKenzie upgraded Southwest (LUV) to Buy from Neutral saying shares are oversold and maintained a $70 price target. The analyst said Southwest's Q1 revenue was disappointing and Q2 Street estimates have come down, but he sees very little risk to full year consensus estimates given network adjustments, a new revenue management system, and a solid seasonal backdrop heading into summer. McKenzie said shares look attractive following yesterday's selloff, combined with superior profitability and more compelling capital returns.