Over the past several years, the Human Factors Analysis and Classification System (HFACS) has been used to analyze nearly a decade of accidents involving the U.S. military, U.S. scheduled and nonscheduled commercial aircraft carriers, and U.S. general aviation (GA) aircraft. The results of these analyses have yet to directly compare the similarities and differences in human error trends across these seemingly diverse aviation communities. The purpose of this paper is to provide that comparison.