Prince George is set to be separated from Princess Charlotte and Prince William as a royal ban will come into place this year.
George, 11, is Prince William and Princess Kate's eldest child and is second in line to the throne.
Prince William is first in the Royal Family's line of succession, and George's younger sister, Princess Charlotte, is third.
George, who will turn 12 tomorrow, was born on July 22 2013.
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|Prince George is set to be separated from Prince William and Princess Charlotte as a royal ban will come into place this year.
There is a royal rule in place that limits which royals can travel together in the same plane.
Currently, Prince William, Prince George and Princess Charlotte can all travel together, but that may change when George turns 12 on Tuesday.
King Charles's former pilot, Graham Laurie, revealed how a royal rule meant that William started travelling on a different plane to his father once he turned 12 in 1994.
Laurie told OK: "We flew all four: the Prince, the Princess, Prince William and Prince Harry, up until Prince William was 12 years old.
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|Prince William is first in the Royal Family's line of succession, and George's younger sister, Princess Charlotte, is third.
"After that, he had to have a separate aircraft, and we could only fly all four together when they were young with the written permission of Her Majesty.
"When William became 12, he would fly normally in a 125 from Northolt, and we would fly the 146 out with the other three on."
If the same method is applied, then Prince George will fly in a separate plane to William, the Princess of Wales and his two younger siblings, Charlotte and Louis.
However, it may be decided that William is the one to fly on his own, and George travels with his mother and siblings.
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|It may be decided that William is the one to fly on his own, and George travels with his mother and siblings.
Another option is that William travels with either Charlotte or Louis, or both of them, while George travels with Princess Kate.
The rule is in place to help secure the heirs to the throne.
The rule can be broken with the monarch's permission, but it is discouraged since, in the event of a crash, the future of the monarchy would be immediately unstable.
Three royals have previously died in plane crashes, including Prince Philip's sister, Princess Cecilie in 1937, the late Queen's uncle, Prince George, Duke of Kent in 1942 and her cousin, Prince William of Gloucester in 1972.