King Charles is believed to be looking to pass on the reins to son Prince William as he continues his recovery from cancer.
The 75-year-old monarch recently joined the Prince of Wales at the Army Aviation Centre last week to pass the role of colonel-in-chief of the Army Air Corps.
According to CBS, royal author Carolyn Harris hinted at a double act from the King from the rare joint appearance with the heir to the throne.
"We're seeing some of the kinds of transitional activities that we associate with the last decade of the reign of Queen Elizabeth II … happening quite quickly during the reign of Charles III," shared the historian.
As per Harris, it indicates that Charles’ reign is a period of transition between the long reign of his mother and the next one of his son.
"Especially with King Charles III's health, his cancer diagnosis, even though [he] has been determined to remain in the public eye as much as possible, there has been a lot of looking to the future," she added.