Raymond James analyst Savanthi Syth attributes the selloff in Spirit Airlines (SAVE) shares, and those of other U.S. airline peers, to the company's commentary about fare weakness spreading to a larger number of markets in the last few weeks and signals that the pressure is due to United (UAL) being aggressive with pricing. However, he believes the pullback is overdone, stating that he doesn't believe this is sustainable given United's stated goal to close its margin gap with Delta (DAL). He has a Strong Buy rating on Spirit Airlines shares, which are down nearly 20% in afternoon trading.