NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall poses for a group picture with pilots and other staff during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall poses for a group picture with pilots and other staff during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall holds on to her hat during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall holds on to her hat during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall walks alongside Group Captain David Arthurton, during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall walks alongside Group Captain David Arthurton, during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall watches a fly past during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

NORTHALLERTON, ENGLAND - MARCH 18: Camilla, Duchess of Cornwall watches a fly past during a visit to RAF Leeming for the 100 Squadron Centenary on March 18, 2017 in Gatenby, Northallerton, England. (Photo by Anthony Chappel-Ross - WPA Pool / Getty Images)

FOLKESTONE, UNITED KINGDOM - OCTOBER 28: Camilla Duchess of Cornwall views the Christopher Foxley-Norris Memorial Wall, which lists the names of all the pilots who took part in the Battle of Britain, as she visits the Battle of Britain National Memorial to The Few on October 28, 2010 in Folkestone, England. (Photo by Indigo/Getty Images)

FOLKESTONE, UNITED KINGDOM - OCTOBER 28:   Camilla Duchess of Cornwall views the Christopher Foxley-Norris Memorial Wall, which lists the names of all the pilots who took part in the Battle of Britain, as she visits the Battle of Britain National Memorial to The Few on October 28, 2010 in Folkestone, England. (Photo by Indigo/Getty Images)