By Guy Taylor Heathrow Airport has “come a long way” in recent years but its third runway plans are a “must” if it wants to stay competitive, the boss of the world’s largest airline services companies has said. In an interview with City A.M., Menzies Aviation chief Philipp Joeinig warned airlines would begin to “look for alternatives” if they see the airport cannot “cope with the growth” in passenger numbers seen across the industry. “That’s why I think that the third runway is a must, you know, if the UK and Heathrow in particular, wants to continue to be a major hub… then capacity increases …