After the Australian Air Force had successfully used a predecessor from Pilatus for more than two decades, the PC-9, they also decided on the youngest trainer from the Swiss aircraft manufacturer. The state-of-the-art PC-21 replaced the PC-9 in 2020 with Squadron 4 in the flight director role. Therefore, the four copies of the unit received a more inconspicuous gray paint instead of the previous strong red color of the trainer aircraft. To commemorate the 100th anniversary of the Australian Air Force at least one aircraft of each type currently operated has received a special logo on its tail.
