UBS upgraded Delta Air Lines Inc. (NYSE:DAL) from Neutral to Buy while increasing its price target from $46 to $66 on Monday.

Analysts say Walmart's thinner margins and price-sensitive shoppers may have influenced the company's decision to speak out.

Tess Stynes - profile from The Wall Street Journal. News, articles, biography and photos.

Our opinions are our own. It can deliver value to Delta devotees, but thanks to its increased annual fee, it's not the no-brainer it used to be.