Most of us know that NATO's airborne early warning aircraft sport the Luxembourg flag and fly with the LX-prefix. Please refer to the NATO order of battle for those!
This is about Luxembourg itself. Since 2005 the Police Grand-Ducale operates an MD902 helicopter on policing duties. Recently, the police acquired two H145Ms. These are crewed by air ambulance pilots and based at Luxemburg/Findel. They sport "Police Lëtzebuerg" titles, and a Luxembourg roundel.
SInce 2019 Luxembourg acquired a singe A400M aircraft. However, this aircraft is not serviced and maintained by Luxembourg itself but is part of the Belgian Air Force A400M fleet which is based at Brussel-Melsbroek.