Jet Aviation Zürich has been offering for charter for many years a fleet of wholly owned Citation Bravos and an Excel. They also offer for charter 3 managed aircraft (a 900EX, a G550 and a Phenom 300).
The Citations are still flying (8 legs today only).
It could be that they will cease later but I have no confirmation. Those of you who wish an answer can always call them: +41 58 158 8686