UBS has upgraded Delta Air Lines' stock rating from Neutral to Buy, raising the price target to $66 from $46, driven by expectations of a recovery in corporate travel and strength in premium and international segments. The airline, with a market cap of $33.25 billion and $61.94 billion in revenue, reported strong first-quarter earnings, exceeding estimates with an adjusted EPS of $0.46. Analysts are optimistic about Delta's financial performance, highlighting its competitive pricing and strategic focus on cost efficiency.