Aircraft
The Illinois State Police have six aircraft used for law enforcement throughout the state, one Cessna 421C and five Cessna 182. These aircraft are stationed at four airports, Abraham Lincoln Capital Airport, DuPage Airport, MidAmerica St. Louis Airport and Whiteside County Airport. ISP has used aircraft for speed enforcement, using stop watch time measurement, since 1959. According to the FAA, aircraft registered to ISP include, a Cessna 182R N291SP, a Cessna 182S N551SP, a Cessna 182S N661SP, a Cessna 182S N771SP, a Cessna 182S N881SP, a Cessna 421C N4131Q and a 1953 Bell H13G N33615.
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