At the end of this month, July 22 to be exact, Prince George will turn 11, and according to the Mirror, when he turns 12 a year from now, he will have to stop flying with his father, Prince William, to protect the monarchy's future.

Until now, Prince William has been free to travel with George and his wife, Princess Charlotte and Prince Louis, whom he has with his wife, Princess of Wales, despite being first in line to the throne. However, as the Mirror writes, "there is an important royal custom to protect the future of the monarchy by limiting who can travel together on the same plane. Once the heir to the throne turns 12, he or she is not allowed to fly with the other heirs to the throne.

On A Right Royal Podcast, Graham Rowley, a former pilot for Prince Charles, revealed some of this royal ritual and how it affected Prince William when he turned 12 in 1994. 'From then on, the prince had to have a separate plane and the only time we were able to fly all four of them together was when they were very young and with the written permission of Her Majesty [Queen Elizabeth]. When William turned 12, he flew normally in a 125 from Northolt and we flew a 146 with the other three."

This part of the royal protocol could be broken with the monarch's permission, but was "discouraged because a crash would instantly destabilize the future of the monarchy," the Mirror reported.

The past is a prelude, and this rule will affect George in 2025, meaning he will no longer be able to fly with his father. The Mirror wrote, "But it remains to be seen whether the young prince will continue to travel with his mother and siblings while his father flies separately, or whether the second in line to the throne [George] will fly solo." [In 1937, Prince Philip's sister, Princess Cecile, died in a plane crash; in 1942, the late His Majesty's uncle, Prince George, Duke of Kent, died the same way; and in 1972, his cousin, Prince William, Duke of Gloucester, died while competing in an air show.

And, as the Mirror reports, these are not the only travel rules that apply to the royal family and their royal rituals. The monarch always travels with a supply of blood and a physician. This fact can be taken to the next dinner party.