Former royal pilot Graham Laurie confirmed this practice, recalling that he used to fly Prince Charles (now King Charles III), Princess Diana, and both William and Harry together only when the children were young. After William turned 12, that changed, and travel required special written permission from the reigning monarch.
Going forward, any travel plans involving Prince George, Prince William, and Princess Charlotte on the same aircraft will require express authorization from King Charles III. While exceptions may occasionally be made, the standard expectation is that they will travel separately.
This shift marks a