Yesterday, sources close to the Prince did not deny the suggestion that flying an air ambulance was a possibility. Last month, the Daily Telegraph revealed how the Duke said he hoped to gain a commercial pilot's licence and was itching to get back in the air.
In New Zealand, he told a Christchurch dignitary he was "longing" to go flying again, and was anxious to keep up his flying hours. A commercial pilot's licence would enable him to be paid for flying civilian aircraft, such as air ambulances.
Royal aides have already said that when the Duke finishes his current "transitional year", as they describe it, he will take on a new role over and above his royal duties.
On Thursday, the Duke and Duchess will visit an air ambulance team during a trip to Crieff, in Scotland.
The East Anglian service, located close to Anmer Hall, the couple's home near Sandringham, is run as a charity and was launched by the jockey Frankie Dettori in 2000 after he survived a plane crash.
However, the Duchess may not be rejoicing at the news that William is set to strap himself back into a cockpit. In the foreword to a book about RAF wives to be published this week, she writes: "I loved my time in Anglesey when William was serving with RAF search and rescue.
"I cannot pretend that I didn't feel anxious at times when William was on shift in howling gales, knowing that he was out flying in extremely challenging conditions, but he loved doing it and I always felt incredibly proud of him."