These aircraft had previously flown using their aircraft registration as their call sign. From today, the Cobham Aviation B717-200 fleet will fly under the "Q-Jet" callsign, with the flight code of 'QJE'.
Incidentally, in Western Australia, Cobham Aviation also operates a fleet of British Aerospace (BAe) 146 / Avro RJ70/100 aircraft. These aircraft will reportedly now fly under the "JetEX" callsign, using 'JTE' as their flight code.
Finally, Cobham Aviation also operates the four Australian Air Express (AAE) BAe 146F (Freighters). It is as yet confirmed if the AAE 146's will also gain a code or not.