When it comes to jet-setting royals, there are some fascinating and strict rules in place to ensure the safety of the King and his family during their overseas travels.
From carrying their own booze to avoid poisoning, to always having a mourning outfit ready for sudden bereavements, each protocol is steeped in royal reasoning.
But one particularly intriguing rule is designed to safeguard the monarchy's lineage by limiting which family members can share a flight.
Currently, Prince William can travel with his young brood, but as they grow up, this will change. On HELLO Magazine's 'A Right Royal Podcast', King Charles' ex-pilot, Graham Laurie, revealed how this rule impacted Prince William from the age of 12 in 1994.
Read more on ok.co.uk