A United Airline aircraft operated by United Continental Holdings Inc. sits on the tarmac at Hong Kong International Airport in Hong Kong, China. (Photographer: Xaume Olleros/Bloomberg)

United Regains Its Rank as the World’s No. 2 Airline

(Bloomberg) -- The airline world has a new No. 2 after United Continental Holdings Inc.’s aggressive domestic expansion pushed the carrier ahead of Delta Air Lines Inc. in terms of passenger traffic.

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