Unionville was first named Harmony when established in 1853 as the county seat for Putnam County . Prior to that the county seat had moved several times , often with heated debate , thus the centralized location hoping to bring " harmony " to all concerned . ( see Putnam County history for more details ) On May 22 , 1962 , Continental Airlines Flight 11 , en route from O'Hare Airport in Chicago , Illinois to the downtown Kansas City , Missouri airport , crashed in a clover field north of Unionville , near Lake Thunderhead , killing all 37 passengers and 8 crew . Investigators subsequently determined that one of the jetliner 's passengers , Thomas G. Doty , detonated a bomb inside the Boeing 707 in a suicide-for-insurance plot
Continental Airlines Flight 11
Continental Airlines Flight 11
Unionville, Missouri