CityJet rarely appears on a ticket you actually bought — it flies aircraft on behalf of other airlines. For a pet owner, the only policy that counts is the one belonging to the carrier that sold you the seat.
Why CityJet has no pet policy of its own
CityJet (IATA WX) is a wet-lease / ACMI operator — it supplies crews and aircraft to other airlines rather than selling tickets under its own brand. When a CityJet-operated aircraft flies your route, the pet rules come from the airline whose name and flight number are on your ticket. Check that carrier’s pet policy.
Look past the aircraft and find the name that sold you the seat — that airline’s policy is the one that applies. Build your full route in Pawgo’s plan-builder and it maps the real pet policy for every operating carrier on your itinerary.