When it comes to flying overseas, a number of important rules are put in place to ensure the King and other members of the Royal Family are protected when travelling abroad and some of them are truly astounding.
These range from bringing their own alcoholic beverages from fear of being poisoned or always packing a black dress in case they are required to return quickly because of a death.
However, another rather grave royal custom sees 'the Firm' have restrictions on who can travel together in the same aeroplane to protect the future of the monarchy.
At the moment, Prince William is allowed to fly abroad with his three young children as they are only small but this will change in just a few years to come, the Mirror reports.
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