shares of united airlines holdings inc ual slid 257 to 4397 monday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 002 to 439169 and dow jones industrial average djia falling 011 to 3441169 this was the stocks second consecutive day of losses united airlines holdings inc closed 1662 below its 52week high 6059 which the company achieved on june 2nd the stock underperformed when compared to some of its competitors monday as southwest airlines co luv fell 107 to 4626 delta air lines inc dal fell 054 to 4213 and american airlines group inc aal fell 242 to 1854 trading volume 126 m remained 28 million below its 50day average volume of 155 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use