Actually, XJT and ExpressJet are two different companies, but are one in the same. Kinda like God and Jesus I guess.
XJT is the holding company that owns ExpressJet Holdings, Inc. Similar to AMR. And, ExpressJet Holdings, Inc. is the company that owns ExpressJet Airlines dba Continental Express.
Now, is everyone properly confused? Good.
I still just use the politically incorrect (but Union friendly) "CALEX". Also, "Express" works fine too.