Being the King or Queen of the United Kingdom and the other Commonwealth realms has its perks. Since Prince William is the second in the line of succession to the British throne, he will be enjoying these benefits sooner or later.

In fact, Prince William will no longer follow one major travel rule when he becomes King. However, Kate Middleton, who is the Queen Consort by that time, will still be required to do it.

When Prince William is King, he will not need a passport to travel. Kate Middleton, on the other hand, will still need to have one despite her husband’s status.

Passports are given by Queen Elizabeth and are issued in the name of the monarch. The document read: “Her Britannic Majesty's Secretary of State requests and requires in the name of Her Majesty all those whom it may concern to allow the bearer to pass freely without let or hindrance and to afford the bearer such assistance and protection as may be necessary.”

For now, Queen Elizabeth is the only one who doesn’t need a passport to travel. However, she still needs to answer a couple of questions regarding her identity for security purposes.

When Prince Charles becomes King, he will not need one as well. And if the time comes that Prince William will be King of the United Kingdom, he will also no longer follow this travel rule.

Meanwhile, Kate Middleton will not only still need a passport when Prince William becomes King, but she is also, reportedly, expected to follow “the proper way of doing things” every single time.

“Holding your chin parallel helps maintain posture while sitting, standing, walking and descending stairs,” Myka Meier, founder of Beaumont Etiquette, said. “When your chin points down or up it gives the impression that you’re not paying attention or not interested in what’s happening. Often walking down a staircase is the grand entrance to a room or event and is the first impression with all eyes and photos on you. To achieve perfect posture one should keep their back straight, chin parallel to the floor, and square the shoulders. When sitting in a formal setting, avoid leaning back in the chair or using armrests because both movements will break posture.”

But this guideline is not exclusive for the female members of the Royal family. Men also need to have a good posture and excellent etiquette.