Three billion plane passengers take to the skies in a year - and that number is expected to double by 2030. How do air traffic controllers learn to keep track of all of them?
Take the winter storms which have battered the Midwest and Southeast United States in recent weeks; they led to many thousands of flights being cancelled. Getting those planes back into the air, resuming their schedules and getting thousands of people to where they need to be is a massive task. It calls for sophisticated technology, and highly trained controllers