Shares of the Big 3 airlines fell Tuesday after Deutsche Bank downgraded them, citing concerns over heightened geopolitical risks, highlighted by the growing trade dispute. Delta Air Lines Inc.’s stock DAL, -2.28% shed 2.3%, American Airlines Group Inc. shares AAL, -1.59% dropped 1.6% and United Continental Holding Inc. shares UAL, -1.07% gave up 1.1%. Analyst Michael Linenberg cut his ratings on all three air carriers to hold from buy, and slashed his stock price target on Delta to $53 from $54, on American to $43 from $60 and on United to $74 from $81. “The possibility that the current trade dispute between the U.S. and its global partners could become something bigger is problematic for the industry’s top line given how closely correlated it is to imports and exports of goods and services,” Linenberg wrote in a note to clients. “Furthermore, the growing trade dispute may cause U.S. companies to reconsider their [capital expenditure] and employment plans, which would adversely impact corporate travel.”via