??????????? ???????? ( surveillance aircraft ) ?????? ??????????????? ????????????????? ???????? ?????. ??????????? ?????????, ???????? ???????????, ???????? ???????????, ???? ????????? , ????????????????, ?????????? (?.??. ??????? ?????????), ??????? ????? ???????????, ???????? ?????????? ????? ^[1] ?????????????? ???????????? ??????? ??? ???? ????????????? ??? ????????????????. ?????? ??????? ?????????????? ???????????, ???? ?????????? ????? ?????????????????? ??????, ????????? ?????????????????? ????????????????? ??????????? ??????? ????? ?????????????.

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• US Centennial of Flight Commission: "Military Use of Balloons During the Napoleonic Era". Retrieved April 1, 2007 .
• Maps of FBI and DHS surveillance flights over the United States in 2015