It started in 1917 when Edward VIII, as Prince of Wales, became the first “royal” ever to pilot a plane. He was closely followed by his brother, eventually George VI. Edward VIII then became the first king to pilot a plane. The King’s Flight was formed and flew the Royal Family on tours around the world. These included Africa, India, and Malaysia, as well as the USA and even, in 1986, China. George VI was flown to Malta to present the island with the George Cross and later, on his death, the new Queen Elizabeth was returned to the UK.
There were accidents, none involving the Royal Family, but this resulted in restrictions being imposed as to who could fly in what type of aircraft. These did not prevent Princess Ann becoming the most frequent passenger of what had become the Royal Flight. There is no longer a dedicated royal flight, as The Queen’s Flight was disbanded in 1997, so the Queen was eventually able to fly in Concord. Did she mind?