Delta Air Lines (DAL) stock is soaring 5.00% in Friday's trading session, buoyed by positive comments from renowned fund manager Bill Nygren. The Oakmark Fund manager and chief investment officer of Harris Oakmark's U.S. division has identified Delta as one of several stocks trading at attractive valuations in the current market environment.

During a media breakfast in New York for Oakmark's parent company, Natixis Investment Managers, Nygren emphasized that Delta Air Lines is among the stocks in his portfolio trading at price-to-earnings ratios in the single digits. This assessment suggests that the airline's stock may be significantly undervalued, potentially offering substantial upside for investors.

The surge in Delta's stock price comes despite a recent security incident at Portland International Airport involving one of the airline's flights. While the Transportation Security Administration (TSA) is investigating how a meat cleaver passed through screening, investors appear to be more focused on the long-term value proposition highlighted by Nygren. The incident caused a delay but did not seem to dampen investor enthusiasm for the stock.