https://en.wikipedia.org/wiki/Janet_(airline)

Janet Fleet

As of 2015, the Janet fleet[17] consists of six Boeing 737-600s painted white with a prominent red cheatline. The fleet is registered to the Department of the Air Force (DAF), while some earlier aircraft were registered to several civil aircraft leasing corporations.[6] Before the arrival of the 737-600s, Janet operated Boeing 737-200s, some of which were modified from military T-43A aircraft. One of the 737-200s with registration N5177C in the 1980s was briefly based in Germany at Frankfurt International Airport (which was at the time also home to a USAF base, Rhein-Main Air Base), and operated by Keyway Air Transport, apparently a front company for a US government operation. It was retired on 6 March 2009.[6] Together with the other 737-200s, it was sent to AMARG at Davis–Monthan Air Force Base in Arizona for storage.[18]

All Janet 737-600 aircraft were acquired from Air China, and four were previously operated by the now-defunct China Southwest Airlines before being acquired for US Air Force operations starting in 2008. The aircraft were initially taken to Wright-Patterson Air Force Base before being transferred to Las Vegas.[19]

One aircraft, a Beechcraft 1900, was lost on 16 March 2004, when it crashed on approach for Tonopah Test Range Airport after the pilot suffered sudden cardiac arrest. Five people, including the pilot, were killed in the accident.[20][21]