Princess Kate and Prince William are “relaxed” as their son, Prince George, has started flying lessons aged 11. The future King is understood to have enjoyed his first flight last week on the final day of his school holidays. An onlooker at the Berkshire airfield said: “He loved it. It’s the right time to start.” The Prince and Princess of Wales watched their son soar into the air and come back to land safely just under an hour later. The treat came on the final day of George’s school summer holiday last week. An onlooker told The Sun: “George is only 11 years old but it is the right time to …