US Department of Justice Fleet Details and History
https://www.planespotters.net/airline/US-Department-of-Justice
Justice Prisoner and Alien Transportation System
The Justice Prisoner and Alien Transportation System (JPATS), nicknamed "Con Air", or ICE Air is an agency of the federal government of the United States charged with the transportation of persons in legal custody among prisons, detention centers, courthouses, and other locations. It is the largest prison transport network in the world. Though primarily used by the Federal Bureau of Prisons or U.S. Immigration and Customs Enforcement, JPATS also assists military and state law enforcement.
The agency is managed by the United States Marshals Service out of the JPATS headquarters in Kansas City, Missouri. JPATS was formed in 1985 from the merger of the Marshals Service air fleet with that of the Immigration and Naturalization Service. JPATS completes more than 260,000 prisoner/alien movements per year. Air fleet operations are located in Oklahoma City, Oklahoma, with hubs in Las Vegas, Nevada; Puerto Rico and the Virgin Islands. Additionally, the Federal Transfer Center at Oklahoma City's Will Rogers World Airport was built especially to facilitate prisoner transport on JPATS.
Usually, the airline employs Boeing 737-400 aircraft to transport convicts and illegal residents of the United States for extradition. Smaller jets and turboprops are also used to transport individual prisoners who are considered particularly dangerous or notorious, as well as individuals in the witness protection program.
https://en.wikipedia.org/wiki/Justice_Prisoner_and_Alien_Transportation_System