JetBlue (JBLU) and Southwest Airlines (LUV) edged lower on Friday after BofA Global Research downgraded both stocks to ‘Underperform’ from ‘Neutral’. According to TheFly, the BofA analyst said both airlines trade at the high end of historical valuation ranges despite less exposure to "the strongest industry trends.

Airline stocks were mixed on Friday after Bank of America upgraded American Airlines Group Inc. and downgraded Southwest Airlines Co. and JetBlue Airways Corp., predicting that the network carriers will continue to outperform low-cost airlines due to demand for premium travel.

Southwest Airlines stock fell Thursday after the Department of Transportation sued the airline over a pair of "chronically delayed flights."