Now aged 27 captain Kate McWilliams and her 19-year-old co-pilot Luke Elsworth fly hundreds of passengers to their destinations this week. Their employer, the British carrier Easyjet, believes McWilliams has become the world's youngest commercial airline captain -- with co-pilot Elsworth also one of the country's youngest co-pilots. Of the 130,000 airline pilots worldwide, just 450 are female captains according to the International Society of Women Airline Pilots, and McWilliams has urged more w