Japan's Civil Aeronautics Act requires aircraft to maintain minimum altitudes of 300 meters over urban areas and 150 meters in other areas, except during takeoff and landing. However, the resolution noted that "low-altitude flights by U.S. military aircraft that disregard Japan's aviation laws have been frequently observed." This marks the fourth time Mugi's assembly has passed such a resolution, following similar actions in 2010, 2012 and 2019. The Orange Route has a history of controversy. In October 1994, a U.S. military aircraft crashed during low-altitude training in northern Kochi Prefecture, killing two crew members. Despite this, U.S. flights have continued in the area, raising long-standing concerns among residents.