BLENHEIM, NEW ZEALAND - APRIL 10:  Prince William, Duke of Cambridge sits in a WW1 aircraft as Catherine, Duchess of Cambridge looks on during a visit to Omaka Aviation Heritage Centre with Sir Peter Jackson on April 10, 2014 in Blenheim, New Zealand. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge.  (Photo by Martin Hunter/Getty Images)