Air travel helps keep businesses running and families connected, but one downside is that aircrafts crash, however infrequently. And, because the British royal family has had several tragic air travel-related incidents in its history, the queen does not like for those in the royal order of succession, which includes Prince William and his father, the heir apparent, Prince Charles, to travel in the same aircraft (via the BBC). For example, the queen's late husband, Prince Philip, lost his sister, Princess Cecilie of Greece and Denmark, along with her children, her unborn child, and several other people aboard a small plane that crashed in Belgium in 1937 (via Little Things). Another tragic plane crash took the life of Prince George, Duke of Kent, in 1942 (per the Royal Collection Trust). Then, in 1972, another of the queen's cousins, Prince William of Gloucester, died in a plane crash at age 30, according to The New York Times.
The royal family continues to travel by plane, but think of the last time there was any news of William traveling with Charles. It may have been as far back as 1983, when William was a baby (per Town & Country). While permission has been granted for William and his children, who are currently numbers three, four, and five in the royal order of succession, it is possible that the queen may be growing more concerned (via The Sun). We wouldn't be surprised if the queen denied William and his children permission to travel together one day.
