shares of united airlines holdings inc ual sank 089 to 4343 monday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 039 to 394994 and dow jones industrial average djia falling 013 to 3370028 united airlines holdings inc closed 969 short of its 52week high 5312 which the company reached on april 22nd the stock demonstrated a mixed performance when compared to some of its competitors monday as southwest airlines co luv fell 094 to 3775 delta air lines inc dal fell 070 to 3423 and american airlines group inc aal fell 142 to 1385 trading volume 40 m remained 58 million below its 50day average volume of 98 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