shares of united airlines holdings inc ual slid 377 to 4591 monday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 043 to 452879 and the dow jones industrial average djia falling 016 to 3539984 united airlines holdings inc closed 1779 short of its 52week high 6370 which the company achieved on march 18th the stock demonstrated a mixed performance when compared to some of its competitors monday as southwest airlines co luv fell 336 to 4917 delta air lines inc dal fell 388 to 3991 and american airlines group inc aal fell 351 to 1951 trading volume 113 m remained 219735 below its 50day average volume of 116 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