Jean LaRene and Mary Elizabeth Owens made five attempts at the world's endurance record at the Curtiss-Reynolds Airport in August during the 1934 Chicago World's Fair in Curtiss Thrush J NR581N "Lone Star" Jean LaRene made another attempt in NR581N on the record with Henrietta Sumner from 8 December to 30 November 1934 over Oklahoma City but experienced engine problems and was forced down after 198 hours and 13 minutes aloft.