Prince William and Kate Middleton break royal travel rules for family trips

The royal family must adhere to several protocols, including restrictions on public displays of affection and prohibitions against giving autographs.

One significant rule involves travel: heirs to the throne cannot fly together to protect the royal lineage in case of an accident.

This rule impacts Prince William, King Charles, and even Prince George, who is second in line to the throne.

According to the Mirror, by age 12, Prince George will be unable to travel with his father or sister, Princess Charlotte, without permission. 

Despite this rule, William and Kate have occasionally flown together with their children with special permission from Queen Elizabeth II. 

In 2014, the couple travelled with their nine-month-old son, George, to New Zealand and Australia.

Historically, Prince William also adhered to these rules, flying with his family until age 12. Only with written permission could he travel with his family afterward. 

Additionally, the royal aircraft is equipped with blood matching the royal's blood type to ensure safety in emergencies, highlighting the extensive precautions taken for the royal family.