I'm not a subscriber so can't see the full article. This is from cargofacts.com:
Air Wisconsin ventures into freighters with CRJ200SF by Charles Kauffman and Jeff Lee September 1, 2021 in Carriers, Freighter Conversions
"U.S.-based regional carrier Air Wisconsin has added its first freighter, a CRJ200SF (7417, ex-ExpressJet Airlines) converted to freighter configuration by Aeronautical Engineers Inc. (AEI), and will soon offer the aircraft for charters and long-term wet leases. Air Wisconsin told Cargo Facts that, even though it historically has only carried a small amount of belly freight..."