During the afternoon on Friday 10 April, LifeFlight (Aeromed) LearJet 45 bizjet VH-CXJ "Ambulance 452" was noted arriving into Mackay Airport from Brisbane.
After a short time on the ground, VH-CXJ "Ambulance 452" then departed to Townsville.
UPDATE! Early on Saturday 11 April, VH-CXJ was noted returning to Mackay Airport from Townsville. It then departed to Brisbane. It appeared to NOT be using its 'usual' Ambulance callsign but rather its registration marking... perhaps a test or training flight.